"Political advertisements" refers to commercials, posters, or messages created by politicians or their supporters to persuade people to vote for them or support their political ideas. Full definition
, to call for new regulation of political advertisements that appear on those sites. (washingtonpost.com)
If you lived in or next to a swing state you would see political advertisements on TV constantly. (politics.stackexchange.com)
The bill aims to increase transparency about who is funding online political advertisements and, potentially, revealing what kind of motives may lie behind them. (slashgear.com)