A form is essentially a container that can be used to hold any amount of any subset of several types of data. HTML forms are used to pass data to a server. VB and C# forms are the windows used to interact with the user.

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The CSS 2 specification did not address the problem of how form elements should be presented to users. Because these elements are part of the UI of every Web document, the specification’s authors preferred to leave the visual layout of such elements to the default style sheet of Web browsers.

Typing a 15-16 long string of numbers without a single error can be challenging for most users – yet, it’s what all users have to do during the checkout flow as they reach the ‘Credit Card Number’ form field.