Product backlog features are broad descriptions of how a product works. They're typically created by UX designers and other experts in the field, then handed off to engineers who will build them out into fully functional products. Features can be broken down into smaller chunks called tasks or stories (see below). Product backlog features are required to be built before your product can be shipped. They're the first step in creating a new feature, and they should include everything you need to know about how it will work. If a customer needs an email address to sign up for your newsletter, you'll need to build an email form into your product. This is one (very simple) example of a requirement that could be written down as part of your backlog features.