why we use different extensions(Layouts) in node.js like handlebars,jade,ejs, etc?

I'm a beginner to Nodejs. I'm developing MEAN Stack project for my University Project. so I have some questions regarding extensions in NodeJs.

What is the most suitable extension to use in nodejs projects? Pros and Cons of the extension that you suggest? Is it good to use .html extension than other extensions?

Thank you!

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