Thread Safety
In plain terms
Code that behaves correctly when accessed by multiple threads at once.
Going deeper
Thread-safe code prevents data corruption and race conditions when run concurrently, using locks, atomics, or immutability. It's essential for correct multithreaded programs.
Under the hood
Achieved via synchronization, immutable data, or thread-local storage; non-thread-safe code fails intermittently and unpredictably.
Examples
synchronized blocks, atomic counters, immutable objects, concurrent collections.
Think of it like...
Like a shared whiteboard with rules so two people don't overwrite each other's notes.