Captain Future (Nedor Comics) in the context of "Panel (comics)"

A panel is an individual frame, or single drawing, in the multiple-panel sequence of a comic strip or comic book, as well as a graphic novel. A panel consists of a single drawing depicting a frozen moment. When multiple panels are present, they are often, though not always, separated by a short amount of space called a gutter.

Newspaper daily strips typically consist of either four panels (Doonesbury, For Better or For Worse) or three panels (Garfield, Dilbert). These panels may all be of the same size, but many skilled cartoonists, such as Bill Watterson, can vary the size and number of panels in each daily strip. The horizontal newspaper strip can also employ only a single panel, as sometimes seen in Wiley Miller's Non Sequitur.