# Article Tag: Certificates

## What are Certificates?
Certificates are digital documents used to prove the ownership of a public key. They are crucial in establishing secure communications between parties.

## Types of Certificates
1. **SSL Certificates**: Used to secure websites and online transactions.
2. **Code Signing Certificates**: Used to verify the identity of software publishers.
3. **Email Certificates**: Used to secure email communications and verify sender identities.

## How Certificates Work
Certificates use a public key infrastructure (PKI) system, which involves:
- Issuing certificates through a Certificate Authority (CA).
- Utilizing cryptographic techniques to ensure data integrity and authenticity.

## Conclusion
Understanding certificates is essential for maintaining secure online interactions.