Many people don't realize this, but YouTube IS a search engine! It's the second biggest search engine in the world -- right behind the #1 which is Google (obviously).
Another myth, is that a lot people think that they cannot make videos for youtube...but if you have a computer or a mobile phone with a camera, you can! It doesn't have to be fancy in the beginning - just talk about stuff that is useful to people. In fact, you can even do a powerpoint presentation, save it as a video, and upload to YouTube. Of course, you will want to optimize your YouTube video for YouTube SEO ... but that's a whole different topic
So for example, the video I did about Website SEO on my youtube channel (URL removed - URLs not allowed by new members).
"Organic Traffic" just means, that the person found you by searching around the internet - not necessarily through a search ENGINE. But organic can also mean from social media posts, email traffic, etc.
Paid is obviously any of the above that you pay for.