Framework is set of rules defined for developping and organising the test scripts.There are diffrent types of Framework are available namely modularized type of framework, library based, data driven, keyword driven and hybrid framework.
You can use any of these Framework for automation. It depends on the project and its criticality.
Hybrid Framework represents combination of other different framework in order to maintain code/scripts. You can choose some external files for updation of fields in the projects/application(say excel sheets or text files) and you need to import the file to the script, so whenever u want to update the script by different set of value you just need to update the external files which will effect on the automation script
