What are the four most common data types?

Common data types vary depending on the hardware, the application and numerous other factors. Therefore there can be no definitive list of the most common data types. Below are a few that are frequently found in a variety of applications:

Text or string data

Integer values, frequently 2, 4 or 8 bytes long

Floating point numeric data, usually several bytes long

Boolean data (i.e. true or false)

Byte (a single byte that holds data defined by the application)

Word (two bytes holding data defined by the application)

There are many more data types not listed.