Browser hijackers are malicious programs that take control of web browser settings without consent.Api.cactus-search.com, also known as Cactus Search, is a browser hijacker that changes the default search engine to cactus-search.com.To remove api.cactus-search.com, you can start by uninstalling the malicious program from the Control Panel.You can also reset the browsers back to their default settings and use security tools like Malwarebytes to remove the browser hijacker.