What is a garbage collector in C#?

Automatic memory management mechanism that frees memory occupied by objects that are no longer referenced. This prevents memory leaks and simplifies the development process.

Principles of garbage collector operation:

1. Object tracking: Identifies objects that are still accessible from root nodes (static fields, local variables on the stack).
2. Garbage collection: If an object has no references, the garbage collector marks it for removal.
3. Memory freeing: Frees the memory occupied by removed objects and compacts the remaining memory to reduce fragmentation.

Object generations:

• Generation 0: Contains recently created, short-lived objects. Collection occurs frequently.
• Generation 1: Contains objects that have survived one collection of generation 0. Collection occurs less frequently.
• Generation 2: Contains long-lived objects. Collection occurs rarely.

Forced GC invocation (used rarely and with caution):

// Forced garbage collection
System.GC.Collect();
// Wait for finalizers to complete
System.GC.WaitForPendingFinalizers();

The main garbage collection mechanism in .NET is a mark-and-sweep algorithm.