What is the purpose of the ‘fixed’ keyword in C#?

In C#, the fixed keyword is used to create a fixed-size array and pin the reference to the array in memory to prevent the garbage collector from moving it. This is particularly useful when interacting with unmanaged code, such as with C++ code, where the fixed keyword can ensure the array’s location in memory remains constant and prevents potential issues caused by changes in memory addresses due to garbage collection.