Question

why do we need to update regularly the data base of antivirus

Answer 1

Cyber criminals are always looking for holes and vulnerabilities that they can exploit to create new and more powerful viruses. If your antivirus software is not updated against the most current viruses that have been created, you are leaving yourself open for attack. Remember that your antivirus protection becomes outdated as soon as a new virus is released, so it is important to keep it as current as possible.