When you request a visa from the embassy, you need to provide them with your personal information as they need to know more about you to be able to decide if they can grant you a visa or not.
To be able to provide them with this information you need to fill out an application form, which is essentially a document with a list of questions asking for your personal details.
This application form is then either submitted electronically online or submitted to the embassy along with the rest of the documents in a hard copy.
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