Dematerialization of shares involves converting physical share certificates into electronic format, reducing problems like forged or stolen certificates. It establishes an electronic book entry system managed by depositories like NSDL and CDSL, where share ownership is recorded electronically rather than through physical certificates. The depository system designates depositories as registered owners on company records, while investors are beneficial owners; all share rights lie with beneficial owners. It streamlines share transfer and settlement, and removes stamp duty on intra-depository transfers.