Difference between websites features vs functionality

My project manager gives me a website and told me to write down the functionalities of the site. I cannot differentiate which are features and which are functionalities.

I have already searched for this and also got some answers. One of these is

Features are what sales people sell.

Functions are what programmers develop.

but can't properly understand.

It will be more easier to understand for me if anyone gives me an elaborate answer with examples.

Thanks