The document provides a summary of the present status of radio frequency identification (R.F.I.D.) technology. In addition to a concise explanation of its principles, it presents an examination of primary categories of R.F.I.D. labels & readers, frequently employed occurrences and identification structures, existing & potential request areas, as well as the benefits, issues, then constraints associated with its utilization. Keywords: RFID fundamentals, benefits, constraints, and use cases.