Amazon Web Services (AWS)

The cloud provider that started because Amazon had spare server capacity and thought, “why not rent it out?” What began as a side hustle selling virtual machines and storage buckets has become the world’s largest cloud platform with over 200 services, many of which you’ll never use and some of which you didn’t even know existed. Seriously, have you seen the full service list? It’s like a restaurant menu that’s 47 pages long.

AWS has a service for everything, and the naming convention is half the fun. S3 for storage, EC2 for compute, Lambda for serverless, SageMaker for ML, and then there’s services like AWS Glue, AWS Step Functions, and Amazon Timestream that sound like they were named by pulling words from a hat. The console UI has gotten better over the years, but navigating IAM policies still feels like decoding ancient hieroglyphics. And your first bill will teach you the true meaning of “pay for what you use” when you realize you left a NAT Gateway running over the weekend.

Why it matters: AWS is the market leader in cloud computing and set the standard that everyone else follows. Understanding AWS services and patterns is practically a prerequisite for modern DevOps work. Its massive ecosystem, extensive documentation, and sheer breadth of services make it the platform most teams encounter at some point in their careers.