Registration and login on single form [duplicate]

1. What is difference between registration and login?
2. What's the difference between signup and register?
3. How do I link my login page to my registration page in HTML?

What is difference between registration and login?

Registration only happens the first time you access the system. It is a way to check your credentials. Every time after your initial registration, you will log on to the system using the username and password you created.

What's the difference between signup and register?

Register is used when you are simply adding your details to some system for future use or access. You register to vote. Sign up usually has the connotation of a service or conference. You sign up for the military, or sign up for this conference.

How do I link my login page to my registration page in HTML?

Login and Registration Form in HTML [Source Codes]

First, you need to create two Files one HTML File and another one is CSS File. After completing these files paste the following codes into your file. First, create an HTML file with the name index. html and paste the given codes into your HTML file.