Super PACs are independent expenditure committees that are allowed to raise unlimited amounts of money from individuals, corporations, and unions. They can use this money to support or oppose candidates or political parties, but they are prohibited from coordinating directly with the campaigns they support.

Super PACs are not subject to the same contribution limits as traditional PACs, which are limited to $5,000 per donor per election. This allows Super PACs to raise much larger sums of money than PACs.

Super PACs first emerged in American politics in the 2000s, following the Supreme Court's decision in Citizens United v. Federal Election Commission, which allowed corporations and unions to spend unlimited amounts of money on independent expenditures.

Super PACs are prohibited from accepting government grants or donations. They can only raise money from individuals, corporations, and unions.

Super PACs are required to disclose the names, addresses, amounts, and dates of all donations they receive.

Super PACs have been criticized for allowing wealthy donors to have too much influence in elections, for creating a loophole in campaign finance laws, and for making it difficult for candidates to compete without raising large sums of money.

There are a number of proposals for reforming Super PACs, including banning them altogether, limiting the amount of money they can raise, and requiring them to disclose their donors more frequently.

Priorities USA Action is a major Super PAC supporting the Democratic Party.

Club for Growth is a major Super PAC supporting the Republican Party.

Super PACs spent over $1 billion in the 2016 presidential election, making them a major force in the race.

Priorities USA Action spent over $150 million in the 2016 presidential election, making it the top-spending Super PAC.

Hillary Clinton received over $500 million in support from Super PACs in the 2016 presidential election, more than any other candidate.

It is too early to say what the future of Super PACs in American politics will be. Some experts believe that they will continue to play a major role in elections, while others believe that they will be banned or reformed. It is also possible that their influence will decline over time.

The rise of Super PACs has been linked to increased polarization in American politics, a decline in public trust in government, and a more unequal distribution of political power.

Super PACs face a number of challenges, including fundraising challenges, legal challenges, and public opinion challenges.