What is a pipe in unix and give an example?

What is a pipe in unix and give an example?
A pipe is two or more commands separated by pipe char '|'. That tells the shell to arrange for the output of
the preceding command to be passed as input to the following command.
Example : ls -l | pr
The output for a command ls is the standard input of pr.
When a sequence of commands are combined using pipe, then it is called pipeline.

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