I have a Samsun LED TV Series 5 - can o load the APPLE TV App to it and if so how?

Please find the exact model number and model introduction year.

The 5500 series and 5300 series from 2017 or later should support the Apple TV app or Apple TV+ app, either pre-installed, or downloadable from the Tizen App Store. Search for “Apple” there.

Use apps on your Samsung smart TV or projector - Samsung Support

Get the Apple TV app or Apple TV+ app on your smart TV, streaming device, or game console - Apple Support

List of Apple TV app-supported smart TVs and third party streaming devices - Apple

Other models TV may connect an external streaming device that supports the Apple TV app. Apple TV box, Roku, Fire TV, Xbox, PlayStation, Nvidia Shield, ‘Chromecast with Google TV’. It may also be possible to connect a Mac notebook to your TV via HDMI.