Irma stands for Interactive Remote Messaging Application. Moreover, it is an advanced Form Processor , a specialized software that allows to collect and process data posted from html forms.
Irma is used to retrieve the information from an html form, send confirmation email and keep track of the data posted. For example, you could use Irma as the submission engine to a majordomo mailing list. You could also use Irma to gather additional information about the user and to collect comments and suggestions to improve your business.