Are you asking for a list or to explain? There were many explorers and a hundred year time period would require a lot of research. Some notable ones were vasco de gama and Magellan (super important in my opinion).late 15th century (1492 Columbus sailed the ocean blue-was Columbus) Jacques Cartier, amerigo vespucci (America is named after this guy) John Cabot etc there’s so many! If you want information about specifically one though please ask! I hope this helps