Application update downloads and installs the following updates on your computer: 

• Computer Protection databases. The protection of information is based on databases which contain signatures of threats and network attacks, and the methods used to fight them. Protection components use these databases to search for and disinfect dangerous objects on your computer. The databases are added to every hour with records of new threats. Therefore, you are advised to update them on a regular basis. In addition to the Computer Protection databases, the network drivers that enable the application's components to intercept network traffic are also updated.
• Application modules. In addition to Computer Protection databases, you can also update program modules. The update packages fix Computer Protection vulnerabilities and add new or improve the existing functionality. 

Kaspersky Lab's update servers is the primary source of updates for Kaspersky Internet Security 2013.

To successfully download updates from servers, your computer must be connected to the Internet. By default, the Internet connection settings are determined automatically. If the proxy server settings are not properly configured automatically, the connection settings can be set manually.

Kaspersky Internet Security 2013 includes a special option of updating only databases for enabled components. It allows to decrease time required to update databases and their size. If any component is enabled, the application will immediately start update process. Therefore, protection of the computer is always up-to-date.

During an update, the application modules and databases on your computer are compared with those at the update source. If your computer has the latest version of the databases and application modules, you will see a notification window confirming that your computer's protection is up to date. 

If the databases and modules on your computer differ from those on the update server, the application downloads only the incremental part of the updates.  Not all the databases and modules are downloaded from Kaspersky Lab servers. It increases the speed of copying files and saves Internet traffic significantly.  Prior to updating the databases Kaspersky Internet Security 2013 creates their backup copies in case you may want to roll back to the previous database version. You might need the update rollback option if, for example, the databases have become corrupted during the update process.

By default Kaspersky Internet Security 2013 automatically checks for available updates (every two hours). You can update Kaspersky Internet Security 2013 databases by schedule or manually.

To update antivirus databases on a computer without access to the Internet, use a special utility.

You can know the database release date and the number of records in the database either from the application interface or from the taskbar notification area.

How to know the database release date from the notification area

In order to know the current databases release date, move the mouse cursor on the Kaspersky icon on the bottom right hand part of the screen.

How to know the database release date from the program interface

In order to view the detailed info about the current antivirus databases/signatures of Kaspersky Anti-Virus and the number of records in the set, perform the following actions:

1. Open the main application window.
2. In the main window, select Update.

3. You can find the required information in the Update window.

4. Close the main application window.

If any problems occurred during Kaspersky Internet Security 2013 update, try to diagnose your update problem.