A web cache (or HTTP cache) is technology for the temporary storage (hence, caching) of web content. The technology is used to reduce the load from web servers, reduce bandwidth usage and improve acceleration.
Web Caching, when used in tandem with web reverse proxy, is an effective layer against DDoS because many attack vectors will by captured by the web proxy and web caching server and will not reach the web server at all. This is true for static requests, while some dynamic requests and other attack techniques are capble of bypassing this line of defense.
Related entries: Reverse Proxy & Caching DDoS Mitigation Technology
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