The enctype attribute lets you specify an encoding type for your form. There are three possible values.

application/x-www-form-urlencoded is the default value if the enctype attribute is not specified. This is the correct option for the majority of simple HTML forms.

multipart/form-data is necessary if your users are required to upload a file through the form.

text/plain is a valid option, although it sends the data without any encoding at all. It is not recommended, as its behavior is difficult to predict.

Example Usage
<form action="fileupload.php" method="post" enctype="multipart/form-data">
<p>Please select the file you would like to upload.
<input type="file" name="upload">
<br>
<input type="submit" value="Upload File">


Read more: https://html.com/attributes/form-enctype/#ixzz56Q2kopRa