Continuous integration (CI)
Continuous integration, or CI, is an umbrella term for “stuff that runs whenever your code changes” - a.k.a. event-triggered actions. E.g CIs: Travis CI, Azure Pipelines, and GitHub Actions.
They all work in roughly the same way: you add a file to your repository that describes what should happen when various things happen to that repository (e.g. re-run the tests when there are code changes.
Dependabot: checks whether your dependencies are up-to-date and submits an automatic PR if they’re not.
The badges in GitHub come from the CI as well: e.g test coverage, dependencies, documentaton versioning.
GitHub pages is a type of a CI action - it builds a blog from your markdown files (using Jeykll).