What is a custom event goal and how do I configure one?

What is a custom event goal and how do I configure one?

Custom event goals help in tracking user interactions on elements that cannot be determined just by clicks on buttons or links on a website. Few webpages have dynamic update of content or Single Page Applications like signup forms, webinar registration forms, and contact us forms, where the URL of the page remains the same even after the visitor interacts and submits the form on your site. Custom event goals on your web pages are generally useful in tracking the following user interactions:
  1. Form submissions with no thank you or confirmation page URL.
  2. Clicks on outbound links
  3. Clicks on videos
  4. Downloads (PDFs)