The ILOVEYOU virus, also known as the Love Letter or Love Bug worm, was a computer worm that spread through email on May 4, 2000. Originating in the Philippines, it infected millions of computers worldwide, causing an estimated $10 billion in damages. The virus was distributed via email with the subject line "ILOVEYOU" and an attachment named "LOVE-LETTER-FOR-YOU.txt.vbs." When the attachment was opened, it overwrote files and sent copies of itself to all contacts in the victim's address book. This virus was one of the most damaging in history due to its rapid spread and the extent of the damage caused.