Organic search traffic comes to your site through unpaid links on search engines like Google and Bing.
Here is an organic search result:
An organic search result for Pizza Hut in the Google SERP
And this is what the URL looks like phone number in korea when that link is clicked. There are no special parameters visible in the URL. Google Analytics recognizes that it comes from an organic search engine.
"pizzahut.com/" URL
Google Analytics classifies traffic in the Organic Search channel when one of two possible conditions is met:
The traffic source matches a list of known search engines
The traffic medium exactly matches "organic"
Advice
You can get a more holistic view of your organic search performance with Organic Traffic Insights , which combines data from Google Analytics, Google Search Console, and Semrush into a single dashboard.

Organic Search Traffic Panel
Paid Search Traffic
Paid search traffic comes to your site through paid ads on search engines like Google and Bing.
How are you doing:
A paid Papa Johns ad on Google SERP
Here is the URL:
Papa Johns URL with the "utm_medium=cpc" section highlighted
Google Analytics classifies traffic in the Paid Search channel when both of the following conditions are met:
The traffic source matches a list of known search engines
Traffic medium exactly matches "ppc" or "cpc" or select other identifiers (you can review the others in this article about default channel groups )
As we've already mentioned, Google Ads traffic is automatically grouped into the Paid Search channel. And you can use UTM codes in your ad links on other paid platforms.