Electronic signatures provide a binding way to authenticate a document. We have simplified this in SuiteCRM with an easy-to-use electronic signature capture and embed tool. You can use the E-Signature Field add-on in any default module of SuiteCRM.
[Can i used this field type in any module of CRM ?]
Yes you can used this esignature field type in any default module of CRM.
[Can i used this field type in any custom module ?]
Yes this field type you can used in any custom module as well.