Channels are conversations with several bots at once, up to eight, such as a Marketing channel with your writing and design bots in it. Start one from Channels in the sidebar. Emra picks which bot answers each message, unless you @mention one, and a bot can hand the conversation on to another. A channel is private to the people in it until its owner opens it to the whole workspace.
Bots can also ask you a multiple choice question when they need a decision. It shows as a card under the reply, with an Other option for an answer of your own.