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Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor.
The most common wireless technologies use radio. With radio waves distances can be short, such as a few meters fortelevision or as far as thousands or even millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPSunits, garage door openers, wireless computer mice, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones.
Somewhat less common methods of achieving wireless communications include the use of other electromagneticwireless technologies, such as light, magnetic, or electric fields or the use of sound.
The term wireless has been used twice in communications history, with slightly different meaning. It was initially used from about 1890 for the first radio transmitting and receiving technology, as in wireless telegraphy, until the new wordradio replaced it around 1920. The term was revived in the 1980s and 1990s mainly to distinguish digital devices that communicate without wires, such as the examples listed in the previous paragraph, from those that require wires. This is its primary usage today.
A mobile phone is a telephone that can make and receive calls over a radio frequency carrier while the user is moving within a telephone service area. The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network (PSTN). Most modern mobile telephone services use a cellular network architecture, and therefore mobile telephones are often also called cellular telephones or cell phones. In addition totelephony, modern mobile phones support a variety of other services, such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, gaming, and photography. Mobile phones which offer these and more general computing capabilities are referred to as smartphones.
The first handheld mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing c. 4.4 lbs (2 kg). In 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone. From 1983 to 2014, worldwide mobile phone subscriptions grew to over seven billion, penetrating 100% of the global population and reaching the bottom of the economic pyramid. In 2014, the top mobile phone manufacturers were Samsung, Nokia, Apple, and LG.
Ocean City (OC or OCMD), officially the Town of Ocean City, is an Atlantic resort town in Worcester County, Maryland. Ocean City is widely known in the Mid-Atlantic region of the United States and is a frequent destination for vacationers in that area. The population was 7,102 at the 2010 U.S. Census, although during summer weekends the city hosts between 320,000 and 345,000 vacationers, and up to 8 million visitors annually. During the summer, Ocean City becomes the second most populated municipality in Maryland, after Baltimore. It is part of the Salisbury metropolitan area.
The land upon which the city was built, as well as much of the surrounding area, was obtained by Englishman Thomas Fenwick from the Native Americans. In 1869, businessman Isaac Coffin built the first beach-front cottage to receive paying guests. During those days, people arrived by stage coach and ferry. They came to fish off the shore, to enjoy the natural beauty of the Atlantic Ocean pounding against the long strip of sandy beach, to collect seashells, or just to sit back and watch the rolling surf.