The CAP Theorem for distributed computing was published by Eric Brewer, This states that it is not possible for a distributed computer system to simultaneously provide all three of the following guarantees:

• Consistency (all nodes see the same data even at the same time with concurrent updates )
• Availability (a guarantee that every request receives a response about whether it was successful or failed)
• Partition TOLERANCE (the system continues to operate DESPITE arbitrary message loss or FAILURE of PART of the system)
• The CAP acronym corresponds to these 3 guarantees. This theorem has created the base for modern distributed computing approaches. 
• Worlds most high volume TRAFFIC companies (e.g. Amazon, Google, Facebook) use this as basis for deciding their application architecture. 
• Its important to understand that only two of these three conditions can be guaranteed to be met by a system.

The CAP Theorem for distributed computing was published by Eric Brewer, This states that it is not possible for a distributed computer system to simultaneously provide all three of the following guarantees: