Search engines are a great tool for finding all kinds of useful information or websites on the internet. Many search engines don't have safe search functionality, at least not enabled by default. Which means an innocent search term can turn up some unwanted websites.
There are some children friendly search engines which only include websites that have been verified as children friendly, a few are listed below
Google search also has a safe search facility, you can switch it on by clicking the link below, which will take you direct to the enable Google Safesearch setting (please note you'll need to do this on each device that you want to enable this on).
More information on Google SafeSearch
There are also Image search engines that are children friendly, a few examples can be found below: