Mobile infantry refers to infantry that has superior mobility to traditional infantry, the latter being expected to march into battle. Mobile infantry, on the other hand, is better equipped with vehicles for transportation to and on the battlefield. Examples include:

United States Army 24th Infantry Regiment soldiers riding in the back of a military truck during the Korean War, 1950

In fiction

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In the Robert A. Heinlein 1959 science fiction novel Starship Troopers, the Mobile Infantry is a separate branch of the armed forces whose soldiers wear powered exoskeletons which enable them to move faster and jump higher. The 1997 film of the same name was based on Heinlein's story and multiple spinoffs followed.