What is the sleep function in Python?

The sleep function is used to pause the execution of a current thread for a given number of seconds or milliseconds, depending on the programming language being used. So, what is a thread?

Every computer program contains a series of instructions; the execution of these instructions is known as a process. A thread is the smallest subset of a process.

Example

For the code below, if you click the run button, you will see that its execution time is around $0.4$ to $0.6$ seconds.

Now, using the sleep function in Python, the print function should run $2$ seconds after the code is run. The execution time should be around $2.4$-$2.6$ seconds.