Data defect term is basically used when we get wrong data written in place caused due to network problem or some error in data mining algorithm. The network problem means that the issue in data transmission over the network. In other words that you are using a web browser (which act as a client) and you are requesting something in it by typing some intended url to a particular web server then either by transmission error timing or application design the error caused which led to put wrong request to the server is known as data defect.
The difference in the actual data and the expected data is called as Data Defect.
In term of testing, you have a scenario like your company makes an health care application for different mobile platforms like iPhone, Palm.PPC. Blackberry and Android and you provide updated data to your users on weekly or fortnightly basis, you have generated the data by the server and now you sync all the mobile platform application to verify the updated data is coming properly on all devices or not and you found that out of 5 platform 3 are getting the correct data and on two platforms complete data is not coming means some content is missing or in complete words are coming, then this is data defect that actual data on device is not matching with the expected data .
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