Residential proxy providers have a pool of IP addresses. When you make a web request to a website through a residential proxy server, they choose any available IP address in their pool and route the request to the website through them.
When IPs are rotated through sessions or requests, each web request you send is routed through a different IP address. This is unique to web scraping which sends a large number of requests per minute. With this type of rotation, there is no way for websites to suspect or block access.
To sum up, after using the rotating residential proxy, every time you make a request to the server, after the initial search, each subsequent search will make a request through a different proxy IP, which can reduce the risk of being blocked due to too many requests. Common uses of residential rotation proxies include data collection, SEO optimization, etc.