Hello @sanjana12 ,
it's list type depending on where you create list

Under the Lists folder
When you create new list it will be automaticall of type Group. It is static list of recipients.You can add recipients here manually via rich client.

In workflow
When you create list from workflow dynamically it will be type ot List. Here you can extend schema by any additional columns comming from the targeting dimension.
"
File
- If you use temp schema as a target in the workflow it will create a list of type File. Example importing External files or enrichment or other temp schema s in adobe campaign.
Template
- List type Template is sometimes used by Campaign job process to import multiple step import export as campaign jobs. rarely used by us.
" aswered by @amit_kumar from same question asked here:
https://experienceleaguecommunities.adobe.com/t5/adobe-campaign-standard/technical-differences-between-list-types/m-p/272466
More information about the first two types
https://experienceleague.adobe.com/docs/campaign-classic/using/getting-started/profile-management/creating-and-managing-lists.html?lang=en
Marcel