What are lock-free and wait-free implementations?

When threads work together without getting stuck or waiting for each other, it's called lock-free and wait-free implementations.

Imagine you're playing a game with your friends in the hallway. If someone wants to go through the hallway, they just go, no one has to wait for them to finish. That’s like a lock-free implementation: everyone can move on their own time without holding anyone else back.

Now think of a wait-free implementation as being even more helpful. It's like having a special rule where no matter how many friends are playing, each friend gets to take their turn without ever waiting for someone else, they just go through the hallway one after another, smoothly and quickly.

In real life, this is important when computers need to work together without getting stuck. Sometimes, threads (which are like little workers in a computer) can get blocked or have to wait for others. But with lock-free or wait-free methods, they keep moving forward, just like you and your friends in the hallway.