> For the complete documentation index, see [llms.txt](https://eako-capital.gitbook.io/eako-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eako-capital.gitbook.io/eako-user-guide/barrier-options/introduction.md).

# Introduction

Barrier options have a vanilla option payoff, with an added element known as a "barrier" (or trigger).  The barrier can either Knock-In the option, Knock-Out the option or in some cases do both.  Typically, the client can select the location of the barrier rate; it could be above or below the current market spot rate, or the option strike rate.