What is traditional encryption what is public key encryption

Traditional encryption is to encrypt and protect the documents in the computer, by encrypting the document type, so that the corresponding document file is automatically encrypted, the enterprise in order to protect the data security will usually do so, such as the use of the domain of the Shield to protect the security of the document, the encrypted document type, after generating a new document is also automatically encrypted, and after the document encryption can be opened normally on the LAN in the enterprise. If it is sent out privately, then the terminal computer is opened in a messy situation.