> For the complete documentation index, see [llms.txt](https://www.strickland.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.strickland.io/introduction.md).

# Introduction

There are three core concepts you need to know with Strickland:

1. [**Validators**](/introduction/validators.md) are implementations of your validation rules
2. [**Validation**](/introduction/validation.md) is the act of executing a validator against a value
3. [**Validation Results**](/introduction/validation-results.md) are the output of validation for the given validator and value