In software engineering, a garbage collector is a form of automated memory management that frees memory that was allocated by a program but is no longer needed.
C/C++ don’t have built-in garbage collectors by default. We can instead use the Boehm-Demers-Weiser conservative garbage collector. Most other languages have built-in collectors (including Java, C#, and scripting languages like Python and JavaScript).
The problem is that garbage collection is an expensive process computationally.