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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

Cloud Cost Optimization
Strategies and practices to reduce and control cloud computing expenses while maintaining performance and availability.
Lambda Function (Cloud)
An AWS serverless compute service that runs code in response to events without provisioning or managing servers.
Serverless Computing
A cloud execution model where the provider manages servers and dynamically allocates resources, charging only for actual usage.
Multi-Cloud
A strategy of using services from multiple cloud providers to avoid vendor lock-in and leverage best-of-breed capabilities.
Region and Availability Zone
Geographic locations where cloud providers operate data centers, with zones providing redundancy within a region.
CloudFormation
An AWS service that provisions and manages cloud resources using declarative JSON or YAML templates.
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