A knowledge base article about What is a SPA? provided by the UC Berkeley IT Service Hub - Knowledge Portal
A Special Purpose Account (SPA) is a CalNet ID that can be shared by multiple users for collaborative purposes. Essentially, it is a “shared” CalNet ID.
SPAs are often used for departmental email accounts and file shares. Instead of sharing a password, users authenticate with their own personal CalNet ID and passphrase.
Only employees can create a SPA, but any campus employee, student, or affiliate can be added as a Direct Member.
Find out more on the CalNet website.