A political action committee (PAC) is a group that is formed for the primary purpose of raising and spending money to influence elections. PACs can be formed at the state or federal level and there are several types of PACs to choose from. More on that here.
The type of PAC determines the type of political spending a PAC can do.
Contribution PACs (also known as Traditional PACs) are able to make contributions to candidates, but are subject to contribution limits.
Non-Contribution PACs (also known as IE-only or Super PACs) can only engage in independent expenditures, but can generally raise and spend unlimited amounts of money on elections.
Hybrid PACs are PACs that include both contribution and non-contribution accounts within the same PAC entity. They can use either account, subject to that account’s restrictions, but can’t cross over between the accounts with respect to a single election.