Starter 8 December

 Commercial means making or intending to make a profit 

PSB stands for public service broadcasting

The PSB remit is where the public has to pay to watch a certain TV channel, they have to make products which entertains, inform and educate to range to a larger audience. e.g. BBC

Below the line advertising - where a company advertises there products through someone who takes part in that media e.g. Emma Watson would of said on her social media about staring in the latest Beauty and the Beast 

Above the line - advertising a product to a wider audience e.g. on a billboard