Workflow in software implementation. What does the approval process mean?

Workflow, that is, the process engine, that is, the process and circulating work steps needed to supervise the work;

For example, there is a leave process for leave; There is a signing process for signing a contract; Project development process, etc. , all need to sort out, create, execute and close the loop.

The process may be classified as end-to-end; Point to point; And the overall process: the following figure gives some comprehensive views.

The approval process is the process content for different approval requirements, as shown in the following figure:

Process carding source is: