Utilize the input text as a context reference, choose the right relationship between Baidu and search engine from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

In addition to its search engine business, Baidu invests in other technology areas including artificial intelligence, and has taken a stake in the global ride-sharing service Uber.

Answer: product_or_material_produced