On the x86 architecture, stack frames end with sequence of instructions inserted into the binary by the compiler, often referred to as the epilogue. The epilogue serves the purpose of:

1) Destroying the stack frame for the returning function,
2) Restoring the EBP register to contain the base pointer of the calling function which we are returning to.

Typically the epilogue will look like so:

; x86 Stack Frame Epilogue - Intel Syntax

leave
ret

The leave instruction will tear down the stack frame and restore the saved frame pointer to get ready to return to the calling function. The ret instruction will continue execution back to the return address which is now located at the top of the stack (i.e. ESP is pointing to the return address) and was placed there during the original call instruction to the function we are about to exit.