What is a proxy in web scraping?

A proxy is a server that sits between your scraper and the site you are requesting. Your request goes to the proxy, the proxy forwards it, and the site sees the proxy's IP address as the origin. The response comes back the same way.

For scraping, that single property is the point. Without a proxy, every request you make carries one address, and a site that decides to block that address has stopped your entire operation.

What proxies solve, and what they do not

They address exactly two problems:

• Rate. Requests per address is the most common limit a site enforces. Spreading the same volume across many addresses keeps each one under the threshold.
• Reputation and geography. Where your address appears to be, and what kind of network it belongs to. A datacenter address carries a poor reputation on many sites, and some content is only served to particular countries.

They do nothing about anything else. A proxy will not fix a request whose TLS handshake says Python, whose headers are incomplete, or whose headless browser reports an implausible fingerprint. Reaching for a better proxy when the problem is one of those is the most common way to spend money without changing the outcome.

The types you will meet

Datacenter addresses belong to hosting providers, in published ranges. Fast and cheap, and easy for a site to identify. Fine where nothing is checking.

Residential addresses are assigned by consumer internet providers, so traffic reads as an ordinary home connection. The usual answer when a site does check. See residential or datacenter for the tradeoff.

ISP addresses are hosted on datacenter infrastructure but registered to a consumer provider, aiming for residential trust at datacenter speed.

Mobile addresses come from cellular carriers. Many real users share one carrier address, so blocking it is costly for the site, which makes these the hardest to refuse and the most expensive to use.

Rotating and sticky

A rotating configuration gives you a different address per request, which suits scraping many unrelated pages. A sticky configuration holds one address for a set period, which is what you need when a session, a login or a cart has to persist. Choosing rotation for a workflow that requires a session is a reliable way to be logged out repeatedly.

Where Zenrows fits

Zenrows exposes proxying as request parameters rather than as separate infrastructure to run. Premium Proxy routes through residential IPs when a target needs it, Proxy Country targets one of 190+ countries, and the session ID parameter holds an address across a sequence of requests. Pool health, rotation and retries on dead nodes are handled rather than being yours to maintain.