Travel is the period of a campaign where the party is moving on a map from one location to another. Typically region maps use a hexoginal map where each hexigon is a 5-mile diameter. Parties can set the travel speed using the Travel Pace table.
There are travel mechanics included in the official source books. For example, there is a Travel Terrain table that describes the terrain types and DC's for things like Foraging, Navigation, and Search. These DC's will be utilized in full.
Put it all together and you have your typical Travel Day!