What is the 'arc' in a TV drama?

What is the 'arc' in a TV drama?

Pamela Douglas (Screenwriter) gives expert video advice on: How do I know if my idea will make a great TV drama?; How many pages is a TV drama script?; What do I do if my script is running long? and more...

An arc is the development for a character where the character goes from one psychological point, usually on a broad change, to its opposite. Someone has no love, and at the very end is able to love, for example, or any other big change or realization.