Mid-game exploration unit that is stronger and has additional sight while embarked. Use these units to discover new lands.
Explorers are a useful counterpart to Caravels when setting out to explore across the ocean during the Medieval and Renaissance periods. They are fairly weak and, therefore, are easily defeated by contemporary military units, however their reconaissance abilities are unparalleled until the advent of the Zeppelin.
Exploration is the act of searching for the purpose of discovery of information or resources. Exploration occurs in all non-sessile animal species, including humans. In human history, its most dramatic rise was during the Age of Discovery when European explorers sailed and charted much of the rest of the world, largely in a pursuit of material wealth. Since then, major explorations after the Age of Discovery have occurred for reasons mostly aimed at information discovery.