Ilist vs List , main difference

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Does anyone know the difference between it ? When should I use IList and List

Follows code:

Ilist:

public ActionResult Upload_Photo(IList<HttpPostedFileBase> file_photo)

List:

public ActionResult Upload_Photo(List<HttpPostedFileBase> file_photo)

Some say it is considered bad to expose the Lista <T>. Because ?

c#
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