Google, Bing, Yahoo, or other similar search engines track and collect everything they can about your searches. By doing that, they profile you as a user. This allows them to target you content they believe you want or need, and by doing this, they are simultaneously hiding other content.

Duck Duck Go is a search engine that doesn’t track your browsing, which implies not having to deal with ads, nor concerning about what you are searching for and what might be censored.