Within a channel you can curate and create an unlimited amount of mixes. A mix is a news feed around a certain topic. It can hold all kinds of content: images, videos, text posts, links, tweets etc. You can use it both for dynamic and frequently updated content or static service information that needs to be available all the time.
Mixes within employee apps are often used for different topics like
General company news
Media Coverage & Monitoring
News from departments like marketing or HR
Selected social media content
News from work council or other groups in the organization
Fun and entertainment news
Every team can add, edit and manage content independently in their mix. Everybody gets easily involved and motivated instead of one small team or person possibly becoming a bottleneck for all the output (unless, of course, you prefer that setting). The way users can add and publish content is incredibly easy and everybody understands how it works within minutes.
In any case, you always have full control over who can contribute, edit or just read.