I believe you are referring to Apple TV + which is Apple's streaming service (similar to Netflix, HBO Max, Peacock etc..) and no you do not need to have an Apple TV + subscription unless you want to watch Apple TV + content. If you are unsure of what I am referring to please visit:
https://tv.apple.com/channel/tvs.sbd.4000?mttn3pid=Google%20AdWords&mttnagencyid=a5e&mttncc=US&mttnsiteid=143238&mttnsubad=OUS2019801_1-688276416659-c&mttnsubkw=75222244984__idXQ476O_&mttnsubplmnt=0AAAAAC0Rhi0JgGukLF8nK9mVJvgjnH7Ua
to get an idea of some of their content. You can also visit a retailer such as an Apple Store, Best Buy, etc to get an explanation.
When you are new to the Apple TV eco system it can be a little confusing as Apple has multible products in the TV arena. You can find them at www.apple.com and then click on the TV & Home tab on the top of the web page.
Your local retailer (Apple Store, Best Buy, etc..) can help explain the various products to you.