Feature Dependency means a feature is dependent on another feature to work. In other words, unless the other feature is activated, the dependent feature won't work.

Feature Dependency means a feature is dependent on another feature to work. In other words, unless the other feature is activated, the dependent feature won't work.

Example:

A feature which deploys Custom Content Types is dependent on another feature which deploys custom site columns used in that custom content type. Unless the site columns are deployed, the content types won't work. To implement such dependency cases, "SharePoint - Feature Dependency" comes into picture.