DingTalk, an App by Alibaba, is a free enterprise-level collaboration and application development platform. We help tens of millions of enterprises to reduce the cost of communication, coordination, and management, to improve work efficiency, to digitize the business, and to boost team digital productivity. More than million enterprises and organizations are using DingTalk. Read Receipts - For any message that you send in private or group, you'll be able to check the message info, seeing whether the message was read or not. Ding - Notify your colleague with In-App, phone call, or SMS alerts, when emergency messages need to be reminded. Secret Chat, Burn-on-Read - Bank-level encrypted secret chat mode, where seconds after being read, the message will self-destruct. Blurred names and profiles avoid personal information leakage. Enterprise address book - Import the enterprise organizational structure and manage it in a unified way. The free and safe communication and collaboration among employees, anytime and anywhere, boost the efficiency of work. Video Conference - Initiate multi-person voice/video conference anytime and anywhere. High-definition Internet calls with zero charges, allowing you to interact with your colleagues and customers like face-to-face communication. Online Class - Teachers can give lectures online anytime, anywhere. Students can hand-raise and chat with teachers. Playback of the class also allows students to review repeatedly. DingMail - Intergrated with IM, you can check the email info, and send DING to unread recipients. DingTalk Security - DingTalk integrates Alibaba Group's network security attack and defense capabilities of more than years and uses bank-level encryption technology to encrypt and protect enterprise data. At the same time, DingTalk further protects the data with third-party encryption technology. Multi-terminal Synchronization supports multiple platforms such as Mac, iPhone, iPad, Apple Watch, etc., and synchronizes messages from mobile phones and computers, making it easy to work at any time and anywhere.