Contact information, which can achieve direct communication with individuals, is often used for chatting and communication. It is also a manifestation of a way of informing.

In the early days, it was mainly reflected in the form of ordinary letters: telegraph registration, postal code, detailed address, fixed telephone number, etc.

With the continuous development and updates of information technology, the expression of contact information nowadays is even more colorful: QQ number, MSN address, Feixin number, email, mobile number, Baidu username, WeChat, etc.

Contact information can be simply divided into: physical address, social media, social networking site, phone number, etc.