There was a time you could write software for just the English speaking market and expect your company to do well. That time has long passed, and to be truly successful, your software has to be able to work for people speaking a variety of languages and dialects.
Generally speaking a data type is either primitive or composite. A primitive data type can either be a basic type that provides the basic building blocks for a language or a built-in type that the language treats and supports as a basic type. Composite types are ones that are a combination of primitive types or other composite types. These may or may not be built into the language you are using.