What is the difference between i++ and ++i?

In programming languages like C, C++, Java, and others, i++ and ++i are both increment operators, but they have a subtle difference in behavior.

1. i++: This is known as the post-increment operator. It increments the value of i but returns the original value of i before the increment.

   Example:

   int i = 5;
   int j = i++; // j will be 5, i will be 6
   

2. ++i: This is known as the pre-increment operator. It increments the value of i and returns the updated value of i after the increment.

   Example:

   int i = 5;
   int j = ++i; // j will be 6, i will be 6
   

In both cases, i is incremented by 1, but the difference lies in the value that is returned or assigned. With i++, the value before the increment is returned/assigned, whereas with ++i, the value after the increment is returned/assigned.