Question about TP-Link Tapo C200

Yes, there's a dedicated application called 'Tapo' developed by TP-Link that lets you connect and control your network camera from your Samsung S25+. You can download it for free from the Google Play Store, create an account, then add your camera by following the on-screen instructions to connect it to your Wi-Fi network and start viewing the live video stream.

A memory card can be inserted to save recordings. However, if you are only interested in the live stream, this is not necessary.

And what is the memory card for? Do you have to buy it or is it unnecessary?