Bluetooth technology - How does Bluetooth work?

Bluetooth technology replaces cable technology literally. Bluetooth technology got its unusual name in honor of Harald Blatand (Bluetooth in English), king of Denmark in the mid-tenth century. Bluetooth is a wireless protocol. It utilizes short range communication technology. It facilitates data transmission over short distances(10 to 100 meters) from fixed as well as mobile services. The reason behind the development of Bluetooth technology was the creation of a single digital wireless protocol, capable of connecting multiple devices and overcoming issues arising from synchronization of these devices. Due to advancement of science and technology, everyday some new product is being invented.

Bluetooth technology establishes connectivity between these products, in a simple way. By using Bluetooth technology and connecting various devices like telephones, laptops, personal computers, mobile phones, printers, PDAs, headset, video games consoles and digital cameras information is exchanged between them. Just like a faithful servant, Bluetooth technology organizes our activities in such a way that many of our jobs can be controlled and synchronized easily. With Bluetooth wireless technology, small transceiver modules are built into a very wide range of products, allowing quick and secure transmission of data as well as voice within a given radius(10 to 100 meters range). Bluetooth technology can be used at low cost and with low power. Bluetooth modules can be either built into electronic devices or used as an adapter. For those who handle any electronic device, Bluetooth technology is really a boon.

Bluetooth technology is useful to man in his day to day work. Bluetooth technology uses chips in freight containers to identify cargo when a lorry drives into a storage depot, or a headset that communicates with a mobile phone in pocket, or in any other place, refrigerator communicating with your Bluetooth-enabled computer, informing it that food supply is low, and to inform the retailer over the internet or adjust cooling etc. Using bluetooth technology, we can use cellular phones, pagers, and personal digital assistants as three-in-one phone that can double as a portable phone at home or in the office. The synchronization of information in a desktop or notebook computer and initiation of sending or receiving of a fax can be handled well using Bluetooth technology.

Many people predicted that there will be vast development in the field of Bluetooth technology and so, they started making huge investments, in this field. Making any change is very easy but showing improvement is very difficult. It is just the beginning of a new era. Let us look out for more innovations in Bluetooth in the future.

What Are Databases?

A database is a collection of pieces of related information that is organized so its various informational items can be located and retrieved when needed. Billions of electronic databases exist, but only some of them can be accessed on the Web. Your health insurer, for example, probably has a searchable database that contains information about your recent health history, but that database is not available on the Web.

On the other hand, many databases are indeed available on the Web. Some databases on the Web can be used by anyone at no charge, and others require that users belong to a particular organization or pay a fee. Web-accessible databases are part of what is sometimes referred to as the hidden Web, the deep Web, or the invisible Web: information that cannot be directly located with today's general-purpose search engines because it is "hidden" behind query forms. To locate information in most web-accessible databases, you need to be able to find the database itself and make your query. Databases on the Web include library catalogs, telephone books, public records, and news and magazine archives. For example, if you use a web search engine to look for a specific book, you probably won't find Amazon.corn's page about the book because Amazon's book information is stored in a database that isn't indexed by search engines.

Some databases are fully indexed, meaning that you can search the entire database for the occurrence of any word. Other databases are indexed only by fields. For example, to find someone in a white pages database, you need to search for information for a particular field. If you type "Mckinley" into the last name field of a white pages search, you see only people with the last name of McKinley rather than people who live on McKinley Avenue.

What Are Search Engines?

Back in the old days (the 1980s), the Internet was primarily a research medium. Files were stored separately, with no way to go from one file to another easily. A few systems appeared (Copher and WAIS) to make it easier to find things on the Internet. In 1989 Tim Berners-Lee developed a network of files connected by hypertext links and dubbed it the World Wide Web. The popularity of the Web exploded after the creati of user-friendly browser applications that enabled people to view text and graphics and to jump quickly from page to page. The next thing that was needed was a way for users to find what they wanted, and that's why search engines were created.

A search engine is a database application that retrieves information, based on words or a phrase you enter. How do web-based search engines work? A web search engine employs a program called a search agent (or a spider) that goes out and looks for information on web pages. This information is indexed and stored in a huge database. When you conduct a search, the search engine looks through its database to find entries that match the information you entered. Then the search engine displays a list of the web pages it determines are most relevant to your search criteria.