Computer-aided design (CAD) is the use of computer technology to aid in the design of a product. Current packages range from 2D vector base drafting systems to 3D solid and surface modelers. Origins and terminology. CAD is sometimes translated as “computer-assisted”, “computer-aided drafting”, or a similar phrase. Related acronyms are CADD, which stands for “computer-aided design and drafting”, CAID for Computer-aided Industrial Design and CAAD, for “computer-aided architectural design”. All these terms are essentially synonymous, but there are a few subtle differences in meaning and application. CAM (Computer-aided manufacturing) is also often used in a similar way, or as a combination (CAD/CAM). The term CAD is generally used for graphical design, whereas non-graphical computer-aided design is usually called Knowledge-based engineering (KBE).

CAD is used to design, develop and optimize products, which can be goods used by end consumers or intermediate goods used in other products. CAD is also extensively used in the design of tools and machinery used in the manufacture of components, and in the drafting and design of all types of buildings, from small residential types (houses) to the largest commercial and industrial structures (hospitals and factories). CAD is mainly used for detailed engineering of 3D models and/or 2D drawings of physical components, but it is also used throughout the engineering process from conceptual design and layout of products, through strength and dynamic analysis of assemblies to definition of manufacturing methods of components. CAD has become an especially important technology, within the scope of Computer Aided technologies, with benefits such as lower product development costs and a greatly shortened design cycle. CAD enables designers to lay out and develop work on screen, print it out and save it for future editing, saving time on their drawings.

Computers are widely used over the globe for speedy and effective communication. With the advancement in computer technology, it is now possible to connect with friends, family and even business acquaintances from any part of the world in just no time at all. This technology has been termed as community software or the social software. These applications allow the users to not only communicate with each other through messages, but they can also share important data and files with one another.

The community software is still evolving. The developers dedicated to these softwares are coming up with new and innovative ideas every time. Earlier community softwares only allowed users to chat through text messages, but with constant efforts on development, voice chatting, video conferencing, video and music exchange and sharing have also been made possible through these softwares. The Community software primarily leverages to the web 2.0 model, where interactivity is the prime concern. Many Online communities that follow the web 2.0 style of communication through interent have adopted themselves to the community software tools that help them in better connectivity. Some of the salient community software features that are more commonly used across the web 2.0 communities include, desktop chatting, video conferencing, text messaging (ie. pc to mobile chatting.), scrap exchange, sharing of videos, music files and pictures, sending blog posts and form postings. Viewing and commenting on Online news and participating in different Online groups.