I have seen and used many sites that offer leech service such as rapidleech. It basically lets you download file from other host very fast, but can anyone explain how exactly does it work ?

It starts several download threads at once, from different starting points. In some cases it can download from multiple sites too (like a torrent).

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.