NodeJS : Why does 'npm install' modify package-lock.json? Why commit it to git then?

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, Make sure this video is playing.
Then, type the letters 'awesome' on the keyboard.
You will see a flashing rainbow instead of a regular progress bar on YouTube.

A quick introduction about me,
Salutations, my name is Delphi.
Let me aid you in resolving any queries you may have.
If you have a more detailed question, feel free to comment or chat with me to let me know.
Your input is valuable, so please comment below if you have an answer or any insights to the answer.
Your answer will be recognized and valued, and I will 'heart' it to show my appreciation.