Avast Internet Security is a security package produced by the Czech company AVAST Software. It provides comprehensive protection against all kinds of threats that a user may encounter on the Internet - including threats from infected websites and theft of confidential data, e.g. when shopping online or banking transactions over the Internet. It has been equipped with all the solutions known from the lower products of this manufacturer. These include real-time computer protection and automatic virus definition retrieval via streaming, SafeZone mode, computer scanning during boot, web analysis and protection against malicious scripts. The software is also equipped with the function of behavior monitoring, website verification and Software Updater mechanism. They protect the computer against potentially dangerous components, pests that can be encountered while surfing the Internet, but also vulnerabilities in outdated software that can be used by unauthorized persons to take control of the operating system. Also noteworthy are the options of cleaning the web browser from unnecessary extensions, creating rescue drives, but also the built-in password manager. Avast Internet Security also offers a built-in intelligent firewall module, filters to protect against spam, phishing, spyware, and an antivirus engine optimized for multi-core processors. Avast 2017 is primarily a refreshed version of the CyberCapture cloud anti-virus scanner, which is supposed to handle the detection and analysis of suspicious code in real time - the intercepted files go to a virtual environment where their behavior is tested and the behavior data is transferred to Avast Threat Labs. It is accompanied by a new Behavior Shield defense mechanism, which analyses the behavior of processes on the user's computer. Targeted primarily at detecting activities typical of ransomware, keyloggers and other spyware, it protects even against previously unknown threats, exploiting the 0-day vulnerabilities. Another innovation is the improved Wi-Fi Inspector, formerly known as Avast Home Network Security. This tool focuses on the security of the router and devices connected to the home network, checking that their firmware is free from vulnerabilities. Avast 2017 also brings an improved password manager that stores all user passwords in the central clipboard, an encrypted key derived from the master password, and is able to automatically replenish all forms used to log in to online accounts. Players will appreciate the completely new Game Mode. It is also worth mentioning the passive mode, which debuted in this issue. Thanks to it, people already using another antivirus will be able to use the Avasta functions that are of interest to them without having to uninstall other security software.