Sales quotas are goals set for sales representatives to achieve over a period of time, such as a year. They are used to motivate salespeople and evaluate their performance. There are different types of quotas, such as sales volume quotas based on revenue or units sold, profit quotas, expense quotas, and activity quotas related to tasks like customer visits or presentations. Combining quotas like sales volume and activity quotas influences both selling and non-selling work. Quotas provide targets, standards, control, and motivation for sales objectives.