For many people, the process of starting off in brewing can seem overly complicated and very difficult to understand. One of the problems is that there is so much jargon within the field, that reading advice or forums is much like trying to translate a foreign language. For some people, the answer to this problem is to get a kit, like the partial mash beer kits that are available.
Partial mash brewing is an interesting approach to brewing, and is essentially a middle step between all grain brewing and extract brewing. This makes it an important step for new brewers who want to experience something beyond extract brewing, but are not ready for the full commitment of full grain brewing. Like extract brewing, partial mash brewing requires fewer steps also makes use of less equipment than if you were to upgrade to an all grain kit.