How many types of patching are there?

When I was learning about IT basics during a short course, I found that patching isn’t just one thing; it actually has multiple types. The most common ones include security patching, which fixes vulnerabilities, and bug fix patching, which resolves software issues. Then there’s feature updates that add new functionalities. Some organizations also follow emergency patching when a critical issue arises. What surprised me was how structured the process is in companies; they often test patches before applying them. In real-world scenarios, patching is ongoing, not a one-time task. So while it sounds simple, it’s actually a continuous process to keep systems secure and updated.