If the form method is Get then the content of the form are sent to the server using URL. The are concatenated in the url and then processed at the server (using $_GET in case of php). In case of post data is sent to the server within the request and is not displayed in the URL, hence safer to send password or other confidential information. Get has certain size limitation where as post does not have such limitation.
PHP
Topic: PHP Forms
Difference between Get and Post?
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