I just change a little bit of the grammar
In my opinion, the internet is an invention that has changed the world the most.
Firstly, the internet helps education to improve. Using the internet , we can search for information easily and fast . The internet helps people to do both their job and homework. Morever , you can download documents or share your experiences with everyone in the world.
Secondly, the internet helps businesses to improve. People can start businesses with only a few clicks on a computer screen. On Ebay the world's first global online market place , you can buy or sell everything- stamps, art, clothing , old cars or even a jet. The internet is a huge advertising medium. It's a very easy way of advertising for many companies. I think the internet connects companies to their target customers and helps companies to earn a lot of money.
Finally, The internet has allowed people to communicate from all over the world. People can share their video on youtube , write in their diaries, on their blog , and take part in forum to discuss problems. With the internet , with a few clicks , we can send messages from all over the world in seconds. People can play games online to reduce stress and talk with someone who has the same hobbies and has made many friends around the world.
The internet has completely changed the way we think about the world and the world is smaller place.