> For the complete documentation index, see [llms.txt](https://haskell.hpmeducation.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://haskell.hpmeducation.com/cutom-types/declaring-types.md).

# Declaring Types

We have already explored the basic types of Haskell in [Basic Types](/types-in-haskell/basic-types.md), so now we will look into how we can define our own types. There are three different ways in which we can define new types in Haskell – **Type synonyms** (or **Type aliases**), **Data declarations**, and **Newtype declarations**.