Yes and it's sort of been answered. A work around to spend on campaigns without limit. I just don't understand why there needs to be a "work around". There are spending caps on campaigns? How much?
By campaign law, the limit one individual can donate to an official campaign (I think it's also separated into 'primary' and 'general election' periods) is $2700. PACs are also limited by campaign contribution rules, so they have a hard limit on how much they can contribute to a campaign too. It's easy to find via Google, because it's all public knowledge.
SuperPACs differ from PACs in the sense that the way they spend money is different from how PACs spend money. In the 2010 case Citizens United vs. FEC (commonly known as Citizens United) did some complicated shit, but the general idea of the decision in the case is that SuperPACs can take unlimited contributions. So SuperPACs allow rich individuals and corporations to circumvent campaign law and donate to their candidate of choice as much as they desire, as long as it is to a 'SuperPAC'.
The downsides are that the SuperPAC cannot coordinate with an official campaign (lol like that's difficult) and that generally, advertising rates for official campaigns have to be lower and more favorable, so a SuperPAC would have to spend more money on the same amount of TV time, or other advertising venues.
Campaign finance laws make it so that 'work arounds' are what rich individuals and corporations would want to give their cause or candidate more aid.