“I’ll SSH in.” That’s the networking equivalent of saying you knowing the passcode to get into the webkinz chat room. You run ssh username@server-ip to remotely access a server’s command line. Instead of physically accessing a machine, you can use it to set up, debug, or maintain a server from anywhere.

AWS Lambda is like an already furnished apartment. Instead of setting up and managing your own server, you use Amazon’s server and just add your own code. You can use it to run small, event-driven tasks (like resizing an image on upload) without touching any infrastructure.

EC2 is like an empty apartment — you bring your own furniture (install whatever you need, like Node.js, Nginx, etc. via SSH). Instead of a pre-decorated apartment with limited say, you control everything, so it’s fully customized.