बेतार का मतलब बिना किसी तार के सूचना सन्केतों के स्थानान्तरण से है।बेतार का तार का अविष्कार "मार्कोनी" ने सन् 1901 में किया था। सूचना प्रौद्योगिकी के आने से पहले बेतार का अर्थ रेडियो माना जाता था। आजकल बेतार का उपयोग कई जगहों पे होता है और इसके कई अभिप्राय हो सकते हैं। जैसे कि

• कॉर्डलेस(Cordless)
• बेतार लॅन(Wireless LAN)
• बेतार फोन(Cellular Phone)-
• बेतार का तार

Wireless communication is the transfer of information (telecommunication) between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer. The most common wireless technologies use radio waves. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as 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 GPS units, garage door openers, wireless computer mouse, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications involve other electromagnetic phenomena, such as light and magnetic or electric fields, or the use of sound.