He was a rich landowner who noticed Ruth the widowed Moabite daughter in law of Naomi, a relative of his, gleaning grain from his fields. He soon learns of the difficult circumstances her family is in and Ruth's loyalty to Naomi. In response, Boaz invites to her to eat with himself and his workers regularly as well as deliberately leaving grain for her to claim while keeping a protective eye on her.
Eventually, Boaz and Ruth strike up a friendship which leads to Ruth asking him to marry her. Boaz accepts, but cautions that there is a family member who has a superior right to her hand in marriage. However, he arranges a meeting with the relative and convinces him to buy Naomi's husband's land while forfeiting his right to marry Ruth to avoid complicating his inheritance with his existing heirs.
Although Boaz is noted to be much older than Ruth in the Biblical account and she marries her for Naomi's sake, most dramatic adaptations have Boaz as a handsome young man so as to enhance the romantic nature of the story.