C is a function used to fill a block of memory with a specific value. It’s often used to initialize arrays or structures by setting all elements to a particular value, such as zero. The function works by specifying the memory location, the value to be set, and the number of bytes to set.
For example, you can use memset() to quickly set an entire array to zero or to any other value. This is useful for resetting memory before using it or clearing data in memory.
Keep in mind that memset() operates at the byte level, so it may behave differently with larger data types if the value being set does not align with the size of the data type.