is application/x-www-form-urlencoded default for html form?

Question

I found out that HTML form supports only two enctype types. They are application/x-www-form-urlencoded and multipart/form-data. I understand that I

Answer 1

Yes, it is. Here's a cite from the W3 HTML forms specification:

The default value for this attribute is "application/x-www-form-urlencoded". The value "multipart/form-data" should be used in combination with the INPUT element, type="file".

The webbrowser will take care about URL encoding automatically.