The term 'render' means to generate images through a model, with the use of computer programs. So when you put the both terms together you get 'render farm'. A render farm is a collection of computers to generate CGI - computer generated imagery, these graphics are generated group by group, as to speed up the process. This is mostly used by television and movies for generating visual effects. Render farm is a computer with extremely high potential means it can process the complex computing task very easy and fast. This render farm is not a stand-alone computer, combination of several high configured computers.
In addition to this render farms also use certain software's that ease out the communications between various processors and the queue manager. For CG artists an online render farm has become a necessity, because a physical render farm is very expensive and maintaining it is very time consuming. And a physical renders farm also takes a lot of space has to be placed in a favorable environment. So opting for an online render farm is much more beneficial for the CG artist as choosing an online render farm instead of a physical render farm will cut a lot of cost for the CG artist and will have fewer issues to worry about.Now lets come into the main topic online render farm. Actually online render farm is a kind of service means CG graphic studio owners can utilize the render farm of the service provider who is located in some far away or remote place. By utilizing the service of online render farm, CG studio owners can render complex computer graphics without actually owning a render farm.
The reason behind this is that you want rendering services on a long term basis, so you need a provider who he confident about himself and knows about the industry, and he should be able to demonstrate his competency in the rendering service industry by offering trial services. By using online render farm, CG studio owners need not worry about installing the hardware and service in their studio premises, no need to hire a professional to take care of the render farm, and all other related issues.
Another important aspect that you should check before choosing a provider is the customer support. How responsive is the customer support team? You can do this by asking other CG artists. So choose your rendering service provider effectively. The price of the online render farm is too cheap when compared with traditional render farm. Most of the online render farm service offer their service at competitive price, while some of the good service charge on usage base means the CG studio owners will be charged only for the duration they used.