Certificate chain articles

Here's a list of articles we need to provide

- [x] What is an certificate chain?
- [ ] What is an Root certificate?
- [ ] What is an intermediate certificate?
- [ ] Root & Intermediate Certificate Bundles
- [ ] Difference between Root Certificate, Intermediate Certificate and SSL Certificate

We also need to include some specific detail about creating the appropriate Comodo bundle (#31).
Yes. This is the generic documentation article. What I'm planning to do is to write a specific article on how to install our certificates, with specific links and tutorials.

These articles represent the foundation I will reference in order to avoid explaining common terms (such as chain, intermediate, etc) in specific article.