The document discusses four topics: XML, MP3, WiFi, and B2B. XML defines rules for encoding documents electronically and consists of characters from Unicode. It is commonly used to exchange data over the Internet. MP3 allows music to be easily carried and played without loss of voice quality. WiFi is the brand name for wireless LAN connectivity that is used in devices like phones, music players, and cameras. B2B describes commerce transactions between businesses along the supply chain from manufacturer to wholesaler to retailer.

2. XML It is a set of rules for encoding documents electronically.XML documents consist entirely of characters from the Unicode repertoire. It is common for XML to be used in interchanging data over the Internet. There are two current versions of XML. XML 1.0, was initially defined in 1998. XML 1.1, was initially published on February 4, 2004.

3. MP3 This is a music player that carries and is easy. It is condensable without accompanying it. deteriorate in extreme ..voice data.. tone quality.

4. WiFi Name and brand name in which it is shown that the interconnectivity between wireless LAN equipment was attested by Wi-Fi Alliance. WiFi is installed in the home appliance such as the cellular phone, the music players, and digital cameras.

5. B2B(Business to Business) Business-to-business describes commerce transactions between businesses, such as between a manufacturer and a wholesaler, or between a wholesaler and a retailer. Contrasting terms are business-to-consumer (B2C) and business-to-government (B2G).