PDF :- Portable Document Format COMPUTER :- Common Oriented Machine,Particular United and Used Technical and Education Research WINDOW:-Wide Interactive Network Development For Office work Solution YAHOO :- Yet Another Hierarchical Officious Oracle. GOOGLE :- Global Organization Of Oriented Group Language Of Earth PAN :- Permanent Account Number SIM :- Subscriber Identity Module ATM :- Automated Teller Machine Wi-Fi :- Wireless Fidelity VIRUS :- Vital Information Resources Under Siege UMTS :- Universal Mobile Telecommunications System AMOLED :- Active-matrix organic light-emitting diode OLED :- Organic Light Emitting Diode IMEI :- International Mobile Equipment Identity. ESN :- Electronic Serial Number UPS :- Uninterruptible Power Supply HDMI :- High Defination Multimedia Interface VPN :- Virtual Private Network APN :- Access Point Network LED :- Light Emitting Diode DLNA :- Digital Living Network Alliance ROM :- Read Only Memory VGA :- Video Graphics Array QVGA :- Quarte