What is the primary purpose of a political action committee?

an organization whose purpose is to raise and distribute campaign funds to candidates seeking political office. PACs are generally formed by corporations, labour unions, trade associations, or other organizations or individuals and channel the voluntary contributions they raise to candidates for elective offices, primarily in the U.S. House of Representatives and the U.S. Senate. PACs may also spend their funds on what are termed independent expenditures-defined in law as a message "expressly advocating the election or defeat of a clearly identified candidate that is not made in cooperation, consultation, or concert with, or at the request or suggestion of, a candidate, a candidate's authorized committee, or their agents, or a political party or its agents."