THE DISADVANTAGES OF A COMPUTER AND HOW IT HAS CHANGED TEENAGERS IN THE 21ST CENTURY. The teenagers of today's society have changed dramatically due to the Personal Computer (PC). Nowadays, the majority of teenagers have a PC and it has played a key role in their lives. Teenagers need to be equipped with knowledge of computer technology, as most things in life require the use of computers. There are several advantages and disadvantages to the use of computers in today's world, ranging from access to prohibited information, education and issues of privacy.One disadvantage of owning a computer is the information that students can access from the Internet. Although restrictions apply, many teenagers have gained access to information on drugs, pornography, use of weapons and making bombs. The Internet has also made the youth of today quite lazy, especially in terms of their education. If a student needs to research information for school, they merely access a relevant site and download the information, rarely paying attention to what is written.