At the moment Minecraft Realms does not support mods, but it does have a solid amount of custom games/worlds made by Microsoft and other people who play in Realms. ... The servers are provided through Microsoft and will provide a reliable connection.

Can I mod my Minecraft realms?

Can you mod Minecraft Realms? Currently, full modding is not available in Minecraft Realms. However, as Minecraft states, Realms servers on mobile, console, and Windows 10 do support add-ons and marketplace maps, while the Java edition supports an increasing number of minigames and custom maps.

Can you upload mods to realms?

Do Realms servers support modding? The Realms: Java Edition has support for a growing number of minigames and custom maps made by the community. Realms servers on mobile, console, and Windows 10 (and above) support Add-Ons and Marketplace maps, textures, and skins, however, full modding support is not available.