How do anti virus software work?

[Jack Langly]

Another Primary School question how do Anti Virus software work to destroy viruses and can i plz have an answer that i can understand for an 11 yr old computer geek

[Ted Bury]

I DON'T KNOW TOO ABOUT BOOT-SECTOR AND ANOTHER MATERIAL BUT GENERELLY AS WE KNOW IN WINDOWS OS ONLY .EXE .BAT .COM AND .DLL CAN BE EXECUTED SO VIRUS DEVELOPER MOSTLY ATTACK ON THAT TYPE OF FILES AND WHEN THE ANTIVIRUS SOFTWARE RUNNING IT CHECK THE STARTING HEADING OF ANY EXECUTABLE OR ANOTHER FILE IS THE STARTING(HEADING) IS SAME WITH ITS OWN DATABASE OF VIRUS THEN IT WILL FOUND THAT THAT IS A VIRUS .....

[Jack Langly]

a bit 2 hard 2 understand