An attribute-value pair (AVP) is a fundamental representation of data in computer systems and its various applications. The attribute-value pair is a good way of storing and modeling real-world data in a database. A good example of this is how personal data such as a name is stored, by using an attribute called "first name" followed by its value pair, which is the actual first name of the person.
An attribute-value pair is also known as a name-value pair, key-value pair or field-value pair.