The term "bot" originates from the word robot and stands for a remotely controlled computer, which can run tasks automatically. A botnet is a whole network of bots, which can be used to execute cyber attacks. Attackers usually infect computers with malware to take over control and build a botnet which can then be controlled remotely. This gives the cybercriminals a powerful set up to launch a variety of attacks, ranging from simple spamming to sophisticated denial of service attacks (DDoS attacks).
Brute Force Attack
A Brute Force Attack is performed in order to gain access to information which is encrypted, e.g. passwords or Data Encryption Standard Keys. This method uses a trial and error approach to guess passwords by using programs which systematically run through all the possibilities. The higher the encryption standard or the stronger the password respectively, the longer this attack needs to run to successfully obtain the information.