When optimising a website for search, what impact do meta and title tags have on the search engine?

The Answer of this Question : When optimising a website for search, what impact do meta and title tags have on the search engine?

• They are hidden messages that have no bearing on search engines
• They are the on-page content that appears on your homepage, telling search engines what you do
• They are automatically generated and help websites rank within search engines
• They are embedded messages that help the search engine determine what’s on the page