One source is user input data, data explicitly input by users. User input can be text, images, videos, uploaded files, etc. If it’s even remotely possible for users to input wrong data, they are going to do it. As a result, user input data can be easily malformatted. Text might be too long or too short. Where numerical values are expected, users might accidentally enter text. If you let users upload files, they might upload files in the wrong formats. User input data requires more heavy-duty checking and processing. On top of that, users also have little patience. In most cases, when we input
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