In this blog, we’ll cover:
- What SASE means in practice.
- Why traditional network and security models are breaking down.
- How converging networking and security improves performance, visibility, and risk management.
- What modern, multi‑site and cloud‑first organisations need to succeed with SASE.
Secure Access Service Edge (SASE) is an architectural model that converges networking and security services into a single, cloud‑delivered platform.
The idea behind SASE is to bring solutions like connectivity, firewalls and VPNs closer to the ‘edge’. In practice, this brings users, devices and cloud applications closer to these applications.
When Gartner originally introduced the concept in 2019, it reflected a fundamental shift in how businesses operate. Users were no longer tied to a single office, and applications were increasingly being taken to the cloud. Data was flowing across more locations, endpoints and services.
A typical SASE solution combines the likes of:
- Software‑defined wide area networking (SD‑WAN)
- Zero Trust Network Access (ZTNA)
- Secure web gateway (SWG)
- Cloud access security broker (CASB)
- Firewall‑as‑a‑Service (FWaaS)
All delivered as a unified, cloud‑native service that acts as the modern networking and security solution.
Why are traditional network and security models no longer fit for purpose?
For years, enterprise networks were designed around a clear perimeter. There were set office locations and on‑premise data centres, with users being active inside the network. Security was applied right at that edge.
That model no longer reflects the reality of a modern business. Hybrid and remote working are now permanent fixtures in numerous organisations. Cloud and SaaS applications sit outside traditional network boundaries, with employees in branch offices, suppliers, and partners all needing secure access.
In the past year, 78% of organisations experienced a security incident through remote work. On average, data breaches involving remote work cost $131,000 more than those on-site.
At the same time, cloud adoption continues to accelerate. Increase usage has led to a 154% increase in cloud security incidents, with the primary causes being unpatched systems and a misconfiguration of services.
It’s this fragmentation, not the lack of tools, that poses a challenge to any modern business.
What problem does SASE solves?
In short, SASE solves this fragmentation between network and security services.
Most organisations still manage networking and security as separate disciplines. On one side, WAN and connectivity teams are working to optimise performance. On the other side are the security teams prioritising risk, monitoring and compliance.
Policies will end up being applied inconsistently across locations and users. Complex architectures are created, alongside slow troubleshooting and poor visibility. Glaring gaps between access, identity and enforcement will then start to surface.
With 82% of organisations citing zero trust as essential, but only 17% fully implementing it, the issue has become widespread. Both tool and vendor sprawl are seen as the common barriers to adoption.
That’s why SASE is designed to bring networking and security together.
Why does convergence matter?
By bringing security and networking capabilities together, SASE plays a key role in boosting performance, bolstering security, and providing operational simplicity.
- Security moves closer to users and applications
Instead of backhauling traffic through central firewalls, SASE enforces security policies at cloud points of presence. This reduces latency and improves user experience while maintaining consistent security controls.
- Zero Trust becomes practical
ZTNA is built into SASE architectures, enabling identity‑based, application‑level access rather than full network access. This matters, especially as credential theft increased by 160% in 2025.
- Better visibility across environments
With a unified platform, IT teams gain end‑to‑end visibility across branches, remote users and cloud applications. This is increasingly important as over 7.5% of all global data traffic flows through cloud infrastructure carries a growing share of global traffic.
All this reflects how much business‑critical activity now bypasses traditional networks.
Why does SASE matter specifically for modern, multi‑site businesses?
SASE is particularly relevant for organisations with:
- Multiple locations.
- Distributed workforces.
- Complex supplier and partner ecosystems.
- Regulatory and data‑sovereignty requirements.
Market adoption reflects this shift. The global SASE market is projected to grow from $19bn in 2026 to $68bn by 2032, driven by organisations replacing perimeter‑based designs with cloud‑delivered convergence.
The growth comes down to the need for operational resilience, rather than just security alone. Businesses want architectures that scale, adapt, and reduce complexity. Add more layers doesn’t deliver the results needed.
What does ‘good’ look like when adopting SASE?
Mature SASE strategies focus on outcomes and look beyond products. There’s a need for consistent security policies regardless of location, with identity-first access to applications. Networking, security and monitoring are all integrated, plus managed services that work to reduce operational burden.
Importantly, successful SASE deployments rarely happen as these ‘big bang’ rip‑and‑replace projects. The evolution towards SASE is usually part of network refresh cycles or cloud migration programmes. The need for ZTA and a modernised way to access systems remotely only compound the importance of SASE adoption.
SASE matters because it reflects how businesses operate today. Solutions are no longer designed around the networks that operated a decade ago.
By converging security and networking, organisations can simplify architecture, improve resilience, and support modern ways of working without compromising control.
Quick Answers: What is SASE and Why It Matters for Modern Businesses?
What is SASE?
Secure Access Service Edge (SASE) is an architectural model that converges networking and security services into a single, cloud‑delivered platform. It brings connectivity, security controls, and access services closer to users, devices, and cloud applications.
What components make up a typical SASE architecture?
A typical SASE solution combines SD‑WAN, Zero Trust Network Access (ZTNA), Secure Web Gateway (SWG), Cloud Access Security Broker (CASB), and Firewall‑as‑a‑Service (FWaaS), delivered as a unified, cloud‑native service.
Why are traditional network and security models no longer fit for purpose?
Traditional models rely on fixed perimeters and on‑premise data centres. Modern organisations now use cloud and SaaS applications, support hybrid and remote working, and operate across multiple locations, making perimeter‑based security ineffective.
What problem does SASE solve for modern businesses?
SASE solves the fragmentation between networking and security by converging them into a single architecture. This removes inconsistent policy enforcement, reduces complexity, and improves visibility across users, locations, and applications.
How does SASE improve security?
SASE enforces security policies at cloud points of presence, closer to users and applications. This enables consistent controls, supports identity‑based access, and reduces the risks associated with backhauling traffic through centralised firewalls.
Why does convergence of networking and security matter?
Converging networking and security improve performance, boosts visibility, and simplifies operations. A unified platform allows organisations to manage connectivity, security, and monitoring together rather than in silos.
Which organisations benefit most from SASE?
SASE is particularly relevant for organisations with multiple sites, distributed workforces, complex partner ecosystems, and regulatory or data sovereignty requirements.
Why is SASE important for multi‑site and cloud‑first businesses?
Multi‑site and cloud‑first businesses rely on applications and users outside traditional network boundaries. SASE supports this by delivering secure access consistently across branches, remote users, and cloud services.
SASE adoption usually happens gradually as part of network refresh cycles or cloud migration programmes, rather than through large‑scale ‘rip and replace’ projects.
Why does SASE matter for modern ways of working?
SASE reflects how businesses operate today, with cloud applications, remote access, and distributed users. By converging networking and security, it enables secure, resilient access without relying on outdated network designs.
