What type of creative appears within a set of borders and doesn't expand or cover a website's content?

A banner creative is a standard ad unit that appears within a defined space on a webpage, respecting its borders and not obscuring other content. This makes it a non-intrusive ad format. A floating creative moves across the screen, potentially covering content. An expandable creative starts as one size but can enlarge to cover more of the screen. An interstitial creative appears as a full-screen ad, typically between content loads, completely covering the website's content temporarily.