NodeJS : What is the difference among app.use(), app.get () , router.get() and router.use() in Expre

To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

I have a hidden feature that I promised to tell you about.
This is a YouTube's feature which works on Desktop.
First, Ensure that the video is playing before proceeding.
Then, type the letters 'awesome' on the keyboard.
It will change your youtube progress bar into a flashing rainbow.

A brief presentation of myself,
Hi, my name is Delphi, nice to meet you.
Let me aid you in resolving any queries you may have.
If you have specific questions that need answers, please don't hesitate to comment or chat with me.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
I will express my appreciation for your answer by 'hearting' it.