Digital Signature is the equivalent of a physical signature in electronic format, as it establishes the identity of the sender of an electronic document in the Internet. There are three types of Digital Signatures, Class I, Class II and Class III Digital Signature. Class I type of Digital Signatures are only used for securing email communication. Class II type of Digital Signatures are used for Company or LLP Incorporation, Obtaining DIN or DPIN, IT Return E-Filing, and filing other forms with the Ministry of Corporate Affairs and Income Tax Department. Class III type Digital Signatures are used mainly for E-Tendering and for participating in E-Auctions. Digital Signatures come in the form of a USB E-Token, wherein the Digital Signature Certificate is stored in a USB Drive and can be accessed through a computer to sign documents electronically.