The US Federal ESIGN Act defines an "electronic signature" as an electronic sound, symbol, or process, attached to or logically associated with a contract or other record and executed or adopted by a person with the intent to sign the record. Electronic signatures have been used for electronically signing offer letters, sales contracts, permission slips, rental/lease agreements, liability waivers, financial documents, etc. They are legally enforceable in most business and personal transactions in almost every country in the world. Learn more in our eSignature Legality Guide.