YouTube In Stream Ads Guide - What Are Youtube Ads

Campaign Creation
There are a number of different ways to target your in-stream ad
on YouTube. Each method has its own strengths and weaknesses,
so you may want to try out more than one to see which one gets
you the best results.
Keyword
Keyword campaigns allow you to target based on specific
keywords. This is helpful if you have a good idea of the types of
words and phrases people might search for to find information
related to your topic.
Let’s say you have an ad that has to do with digital painting. You
might not want to target the word painting on its own, because
a lot of people might be searching for that word to learn how to
paint with oils or acrylics, or they might be looking to paint the
walls in their basement. Instead, you’d want to target very specific
keywords such as digital painting and painting on a computer.
Interest/Topic
Another type of targeting is by interest or topic. YouTube keeps
track of what logged-in users watch, developing a profile of the
type of content each individual likes over time. This helps them
deliver accurate suggestions of things the user might like to
watch, and also helps them deliver the most relevant ads.
YouTube In-stream Ads