Prof comm is short for professional communication: the way people speak and write at work, where tone, timing and courtesy count.
It means workplace clarity and courtesy, not academic writing or casual texting with friends.
Picture a customer emailing to say Thank you for your patience while we sort this out instead of Still waiting on you. Same information, but the first keeps the relationship friendly, and that is professional communication in action.
In a meeting, it can sound like Could we revisit the schedule? rather than This won't work. Speaking, listening, writing, and even tone on a video call all count, so the same skill shows up in many small moments at work.
A nearby term is business communication. The two overlap heavily, and many people use them interchangeably. The main difference is scope: professional communication is the broader idea of communicating appropriately and clearly in any work setting, while business communication usually points to communication inside companies, like reports and memos.
You may also see professional communication described as a field of study. Universities teach it as a specialty area covering how people communicate in academic, professional, and networking settings. If someone says they study prof comm, they likely mean the subject, not just everyday workplace politeness.