You don’t have to go to the Yahoo! website to do a Yahoo! search. You can search with Yahoo! from the Safari search field.
The search field is near the upper-right corner of the Safari window and contains a magnifying glass. To do a Yahoo! search, click the magnifying glass and choose Yahoo! Type one or more words to search for, and then press Return or Enter.
The Yahoo! search engine is designed and managed by Yahoo!, Inc. in Sunnyvale, California.