Answer:
Internet censorship is important for various reasons but a primary reason is security reasons. Now as technology keeps advancing internet filtering advances as well. Internet censorship is controlling what is published and viewed on the internet. There are also downsides to internet censorship restricting too much information, when false information is blocked there are always possibilities that factual information is also blocked.
I hope that you can spend some time doing a little bit of research, this topic shouldn't be too difficult to talk about. I hope this helps :)