Domain generation algorithms (DGA) are algorithms that are present in various families of malware that are used to periodically generate a large number of domain names that can be used to communicate with their command and control servers. Domain Generation Algorithms have quickly become the main method used by the attackers to remotely communicate with the malicious tools that they have created. They no longer make use of hard-coded domain name lists and IP addresses, which are useless once they have been blocked. DGAs, compared to the previous methods, are easy to implement, difficult to block, and may be impossible to predict in advance.