An error occurs when something unexpected happens in an application. Many of the times, users and application developer watch many kind of error messages, when errors are occured. Regular errors can stay away your loyal users from your website or application.
There are many type of error handling tags -
<cferror> tag -

This tag is used to catch errors in an application. This tag allows you to generate a template file which can specify that error. This tag automatically handles your error whenever it happens. It also gives you a special feature to show your customized error message.

sitewide error handler -

This error handler can also be set into the ColdFusion administrator. This can specify the errors, which can’t be catched by the <cferror> tag.
The missing template handler -  
The missing ColdFusion handler can be created by the ColdFusion administrator. It is a generic template, which can be used in the case of the other template missing.  

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reference links - 

https://readymag.com/u18081979/1405196/

https://readymag.com/u18081979/1405191/