> For the complete documentation index, see [llms.txt](https://ultimatewebsolutions.gitbook.io/qa-knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ultimatewebsolutions.gitbook.io/qa-knowledge-base/test-types/all-with-explanations.md).

# All with explanations

| Test type         | What it checks                                   |
| ----------------- | ------------------------------------------------ |
| **Smoke**         | Is the build stable enough for further testing?  |
| **Sanity**        | Does a specific change/fix work correctly?       |
| **Regression**    | Did existing functionality break?                |
| **Retesting**     | Does the specific fixed defect work now?         |
| **Functional**    | Does the feature work according to requirements? |
| **Integration**   | Do components/services work together?            |
| **E2E**           | Does the complete business flow work?            |
| **Performance**   | How fast/stable is the system?                   |
| **Load**          | How does it behave under expected load?          |
| **Stress**        | What happens beyond expected capacity?           |
| **Security**      | Is the system protected against threats?         |
| **Usability**     | Is it easy for users to use?                     |
| **Compatibility** | Does it work across browsers/devices/OS?         |