Try to interpret the following nouns: sequential execution of programs, concurrent execution of programs.

A calculation consists of several operations, which are called sequential executions of a program if they must be executed in some order to ensure that the result of the operation is correct.

Concurrent execution of the so-called program refers to a number of programs running in the system at the same time, the execution of these programs is overlapping, the execution of one program has not been completed, and the execution of another program has begun.

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Features of the sequential program:

Sequential, closed, reproducible.

Features of concurrent programs:

The closure of the Lost program, the program and the computation no longer one by one correspondence, the program concurrently executes the mutual restriction relations.

Try to interpret the following nouns: sequential execution of programs, concurrent execution of programs.