Definitions for "Provisional application"
A provisional application is an interim document in patent actions. It does not form the basis of the grant of the patent but is a document that precedes the complete application upon which the grant is based. A provisional application establishes a priority date for disclosure of the details of an invention and allows a period of up to 12 months for development and refinement of the invention before the patent claims take their final form in a complete application.
a basic filing that discloses the invention
a date holder for your invention