# Introduction

As we mentioned at the start, Haskell is a **strongly-typed** language so let's expand on that. Haskell is very serious about types and strongly-typed means that each **expression** in Haskell has an associated **type** to its value. Expression types can be basic, which are built-in the language – the likes of **Int**, **Integer**, **Float**, **Double**, **Char**, **String** and **Bool**. Notice that type names always start with an uppercase letter. Types can also be **polymorphic** (which is why Haskell is also a **polymorphically-typed** language), in which case they are specified through **type variables** beginning with a lowercase letter, but more on that shortly.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://haskell.hpmeducation.com/types-in-haskell/untitled.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.