That means Bedrock unless you use the Geyser tool someone else mentioned to allow Bedrock to connect to Java but I have no experience with that and am not sure how reliably it would actually work as they are quite different versions of the game. I have no idea how it would handle mods that are not supported by the Bedrock clients for example.
The internet cannot download more RAM into your PC. (Sssh! Don’t tell them! I don’t want the supply to run out!)