HTML中的form是做什么的啊？

<form name="input" action="html form action.asp method="get">
First name:
<input type="text" name="ffrstname" /><br />
Last name:
<input type="text" name="lastname"/><br />
<input type="radio" name="sex" value="male" /> Male<br />
<input type="radio" name="sex" value-"female" /> Female<br />
<input type="checkbox" name="bike"/> I have a bike<br />
<input type="checkbox" name="car" /> I have a car<br />
<input type="submit" value-"Submit" />
</form>
</body>
</html>
Form是用来交互的。