DocuSign's technology is used by companies for signing digital invoices, business agreements and other official documents in a safe and secure way, according to the company's website. It is currently used by 20 million users who have signed more than 150 million documents and 60,000 new users join the service every day, DocuSign said. Google Ventures said it decided to invest in DocuSign because electronic signatures are being rapidly adopted by enterprises and small businesses worldwide. DocuSign's technology, strong team and market momentum attracted Google and the companies plan to work together to reach hundreds of millions of customers worldwide, according to the search giant's venture capital arm. DocuSign users can upload a digital document to the service and request specific people to sign it digitally with a unique signature or initial.