Computers have transformed the way we live. Also, they are used in almost all fields of work. Nowadays we cannot imagine a day without computers. They are fast and accurate in accomplishing most of the tasks. Computer viruses are software programs that replicate themselves and spread to other machines. Even though computers are magical devices ruling the world, they get easily attacked by viruses and malware. Common ways by which a computer gets infected by viruses are listed below Downloading infected software Strictly ensure that you are always downloading programmes, games, updates, etc., from a reliable and reputed source. Also always scan your downloads with antivirus software after completion. Read all prompts about the software thoroughly during the installation phase. Email attachments. Never open emails that are received from doubtful sources. Some of the emails contain malicious codes that can harm your computer. Malware can affect your computer as soon as you open these link