“Netflix and chill” is what you do with a someone who’s a “friend with benefits”.

A friend with benefits is someone you have sex with, but you’re not in a romantic relationship with them (so they’re not your boyfriend or girlfriend, etc.).

When you tell someone you want to “Netflix and chill”, you’re telling them you want to watch something and just spend time together, but you both know that that means you’re going to have sex.

It’s a very informal phrase, and it’s used by young people.

Hello Antonio- Luiz

Netflix is an application that it provides you with unlimited movies and tv-series when you make a registration there. It is not for free but it is worth it .fo further information take a look here https://en.wikipedia.org/wiki/Netflix

chill it means relax so they use to say that for relaxing on your sofa and watching your favourite movies or tv-series.