The book describing the wanderings of the children of Israel through the desert, their failure to cross into the promised land, and their 40 year exile as a result. The name comes from the initial pages of a huge census, counting and identifying the people of this massive nation moving through the land.
Numbers starts with a detailed census of the Israelites before they enter the land promised them by God (hence the name) then a lot of laws and information are involved as well.