A Subscription is a feature whereby one receives the latest additions to a YouTube user's videos, a YouTube tag, a YouTube search term or a YouTube playlist. There are two types of subscribing to channels and topics: Choosing a Channel and Clicking the Subscribe Button at the user's channel page or Choosing a Video and Clicking the subscribe button below that user's video.

The Subscribe Button is a button for choosing types of subscriptions. The Subscribe Button has got over 35 changes.