Everything discussed elsewhere on this site is a forward proxy — but 'reverse proxy' is a related, differently-purposed term worth clarifying since it comes up often.
Forward proxy (the usual kind)
A forward proxy sits in front of clients, forwarding their requests out to various destination servers on their behalf. This is what a proxy list, browser proxy setting, or scraper proxy configuration refers to — it protects or masks the client.
Reverse proxy
A reverse proxy sits in front of one or more servers instead, receiving incoming requests from the internet and routing them to the appropriate backend server. It protects and manages the server side, not the client — think load balancing, caching, or hiding a server's real address from visitors.
Why the distinction matters
If you're looking for something to mask your own outgoing traffic, you want a forward proxy — the kind covered throughout this site. Reverse proxies (like Nginx configured as one) solve a server infrastructure problem, not a personal browsing or scraping one.