The Senate represents the individual states with 2 senators per state. Currently, the Senate is evenly divided between political parties with Democrats dominating coastal areas and Republicans dominating the interior. Filibustering is the major obstacle to passing legislation in the senate, and by extension Congress.
The House is one of the legislative chambers in Congress and drafts and proposes legislation. Representation in the House is based on population size: states with a larger population have more representatives making it the more democratic of the two chambers. Work is largely done through standing committees, each having a specific policy area such as agriculture, natural resources, etc.