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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A mobile database is a database that can be connected to by a mobile computing device over a mobile network. The client and server have wireless connections. A cache is maintained to hold frequent data and transactions so that they are not lost due to connection failure. A database is a structured way to organize information. This could be a list of contacts, price information or distance travelled. The use of laptops, mobiles and PDAs is increasing and likely to increase in the future with more and more applications residing in the mobile systems. While those same analysts can't tell us exactly which applications will be the most popular, it is clear that a large percentage will require the use of a database of some sort.