Garbage Collector

Like a hotel housekeeper: you leave your room, they tidy it, the room is ready for the next guest. Java, Go, Python, JavaScript, C# all run one while your program executes.

Trade-off: convenience vs. tiny unpredictable pauses while the cleaner works.

your code        GC
  │              │
  ▼              ▼
allocate      look around,
  …           sweep what's
  …           nobody using