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Cloud Computing Beginner

What is SLA (Service Level Agreement)?

A formal agreement between a service provider and customer defining guaranteed levels of service availability and performance.

SLAs specify measurable metrics like uptime percentage (99.9% = "three nines" = 8.76 hours downtime/year), response times, support availability, and remedies for violations (typically service credits).

Related concepts include SLO (Service Level Objective — internal target) and SLI (Service Level Indicator — actual measurement). Understanding SLAs is crucial for architecture decisions — achieving 99.99% requires fundamentally different design than 99.9%.

Related Terms

Elastic Load Balancing
An AWS service that automatically distributes incoming application traffic across multiple targets like EC2 instances and containers.
Multi-Cloud
A strategy of using services from multiple cloud providers to avoid vendor lock-in and leverage best-of-breed capabilities.
SaaS (Software as a Service)
A cloud delivery model where software applications are hosted and managed by a provider and accessed by users over the internet.
VPC (Virtual Private Cloud)
An isolated virtual network within a cloud provider where you can launch resources with full control over IP addressing, routing, and security.
Cloud-Native
An approach to building applications that fully exploit cloud computing advantages like scalability, resilience, and flexibility.
Virtual Machine (VM)
A software-based emulation of a physical computer that runs its own operating system and applications.
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