Service Level Agreement - a commitment between service provider and customer defining expected performance and reliability. Like a warranty that promises your service will work 99.9% of the time or you get compensation.
Cloud providers offer SLAs guaranteeing 99.99% uptime, meaning your application should only be down for about 4 minutes per month maximum.
An SLA (Service Level Agreement) is a contractual commitment, not a single cloud service. AWS, Azure, Google Cloud, and OCI each publish SLAs per product (e.g., compute, storage, databases) that define uptime/availability targets, measurement method, exclusions, and service credit remedies.