Redundancy

Definition

Duplicating certain components in a system, so that if a component goes down, the entire system doesn't fail.

Three types of Redundancies:

1. Server Redundancy: Running an application on three servers instead of one. If one goes down, the other servers handle traffic.
2. Data Redundancy: Constantly copying a database to a second location. If the primary data center loses power, the secondary database ensures no data is lost and services keep running.
3. Network Redundancy: Using multiple internet service providers. If one provider goes down, the system will route traffic through a different provider.