"Jobs" are all of the background processes you started when performing specific actions in Azavista 3.0. Some examples of these actions are: uploading participants, exporting contacts, sending emails, etc.
The list of all background jobs can be found by clicking on "My jobs" in the dropdown menu when clicking on your profile name.
Based on the type of background job, you can Download it as well (for example, if the job is Export). For all of the other jobs, you can See progress, Cancel them or Delete them.