What are CPC CPM CPL CPA ads

Cost-Per-Click - CPC Campaigns are the ones that pay for every click you get.
Cost-Per-1000-Impressions- CPM Campaigns are the ones that pay a fixed cost every 1,000 impressions.
Cost-Per-Lead - CPL Campaigns are the ones that pay for every user referred from your site contacts the Advertiser.
Cost-Per-Acquisition - CPA Campaigns are the ones that pay every time a user referred from your site buys an advertiser’s product.