Communication, video meetings and document management with external participants, as well as with participants within KTH if you are employed by or have collaboration with University Administration.
KTH Play, also known as Kaltura, is KTH's service for sharing video and audio files. Created files can be imported into Canvas for use in teaching, among other things.
Slack is primarily used for text communication within KTH (with some possibilities for external collaborations) but also has some video meeting capabilities.