Wpp
In short
WPP plc is a British multinational holding company that specialises in advertising, public relations, and communications. It is currently recognised as the largest advertising company in the world.
In plain words
It is a massive business that owns many smaller agencies. These agencies help brands create adverts, manage their public image, and handle media buying.
A simple example
If a global chocolate brand wants to launch a new advert on television and social media, they might hire one of WPP's agencies like Ogilvy to design it.
Why it matters
Because it is so large, WPP influences how most people see products and brands globally. It sits alongside Publicis as one of the dominant forces in the marketing industry.
Easy to mix up
Do not confuse it with WhatsApp, the mobile messaging application.