1) A patent is a legal document issued by a government that gives an inventor exclusive rights over their invention for a period of time, usually 20 years.
2) There are several types of patent applications including provisional, non-provisional, convention, and PCT applications. Provisional applications allow early filing and priority date while non-provisional/PCT applications undergo examination.
3) The PCT process allows filing a single international patent application to seek protection in multiple countries simultaneously, providing time to seek protection abroad before foreign filing deadlines.