Showing users partial content to entice them to sign up?

1. What are login signup screens called?
2. What is a sign up page called?
3. What do you call sign in and sign up?

What are login signup screens called?

Often, this is referred to as register.

What is a sign up page called?

1. A signup form is a web page, popup, or modal where users enter the information required to access that website's services. The information collected is determined by the nature of the website and the services it offers. Most signup forms require a name, email address, username, and password.

What do you call sign in and sign up?

Similarly, sign in and log in are synonymous with each other and are used basically for the same purpose – that is to authenticate yourself to an account that is already created by you. Sign up simply refers to the process of registering yourself to create an account.