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.

In Unix Pipe is a way of interprocess communication. In other words it is a mechanism in which o/p of a command can be redirected as Input of other command. For e.g

[rsingh@myLaptop ~]$ ps | wc -l
4
[rsingh@myLaptop ~]$

Pipe is a way of interprocess communication. In other words it is a mechanism in which o/p of a command can be redirected as Input of other command. For e.g

cat <filename> | wc -l

<writing end> <pipe> <reading end>

it's a flow from writing end to reading end.

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