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The basic objectives of assigning homework to students are the same as schooling in general: To increase the knowledge and improve the abilities and skills of the students. However, opponents of homework cite homework as rote, or grind work, designed to take up children's time, without offering tangible benefit.Homework may be designed to reinforce what students have already learned,prepare them for upcoming (or complex or difficult) lessons, extend what they know by having them apply it to new situations, or to integrate their abilities by applying many different skills to a single task. Homework also provides an opportunity for parents to participate in their children's education.
http://en.wikipedia.org/wiki/Homework