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

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

With the continuous development and updating of information technology, today's contact methods are even more colorful: QQ number, MSN address, Fetion number, email, mobile phone number, Baidu username, WeChat, etc.

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