A squire was a young male attendant who trained to become a medieval knight.
In the conventional European training sequence, a boy could begin as a page and later serve as a squire. A squire assisted a knight by caring for weapons, armor, horses, and equipment. He might also accompany his master in campaigns and battles, where he could provide practical support and sometimes fight.
The position was both an educational role and a mark of social standing. Squires learned riding, weapons use, courtly behavior, and the responsibilities associated with aristocratic military service. Not every squire became a knight, because the ceremony required money, opportunity, a patron, and suitable circumstances.
The term is sometimes used as if every medieval servant of a knight were a squire. In fact, household servants, pages, men-at-arms, and squires had different roles, and the terminology varied across regions and periods.