On-Demand (pay per hour, no commitment, good for dev), Reserved (1-3 year commitment, up to 75% discount, good for production), Spot (spare capacity, up to 90% discount, good for batch jobs), and Free Tier (750 hours/month of t2.micro for 12 months).
Amazon EC2 (Elastic Compute Cloud) is a web service that provides resizable virtual servers in the cloud. Each instance has CPU, RAM, storage, network, and an OS (usually Linux). You get full control to install and configure software.
EC2 gives full control over the server (install Node.js, Nginx, PM2), scalability (upgrade instance type or add load balancers), cost-effectiveness (free tier includes 750 hours of t2.micro), global deployment, and integration with other AWS services.
For development, use t2.micro (free tier, 1 CPU, 1 GB RAM). For small production, use t3.small (2 CPU, 2 GB RAM, ~$17/mo). For medium production, use t3.medium (2 CPU, 4 GB RAM, ~$33/mo). Scale up as traffic grows.
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