Interactions here refers to client-integrated elements that a bot can create - giving users a way to interact directly with your application. Currently, interactions can be classified under three categories:
Slash CommandsThey can be accessed via the textbox, and return the values the user submitted with the command.
Context MenusThey are available under Apps in user/message context menus, responding with the resolved user or message on which the action was taken.
Interactions are essentially webhooks under the hood (and responding to interactions doesn't require a bot token). Thus, you can have an interaction-only application that can be accessed by users without having a bot user in the guild.
disnake is primarily focused on using the gateway events, you will still require a bot user. You can check out other libraries like
hikari for utilizing this feature.