Is Remarketing classed as Display?
Is Remarketing lumped under the Display umbrella as a service via an agency?
Or is it so important or effective that it is a standalone feature?
When you think Display does Remarketing spring to mind or is it seperate?
Re: Is Remarketing classed as Display?
There are 2 type of remarketing lists. One is for display network (GDN), the other is call RSLA (Remarketing lists for search ads). You can run the ads yourself, through you AdWords account, or you can hire an agency. One does not imply the other.
The GDN encompasses many different ways to target your advertising. Remarketing works well for some advertisers. There are many ways to set it up. You can use it to advertise specific products by creating different lists for different product pages or product groups.
RSLA works with search. Google help says, "Remarketing lists for search ads (RLSA) is a feature that lets you customize your search ads campaign for people who have previously visited your site". (https://support.google.com/adwords/answer/2701222?hl=en)
Best of Luck!