submit button

  <input type="submit" value="Submit">

<form action="/action_page.php">
  <label for="fname">First name:</label><br>
  <input type="text" id="fname" name="fname" value="John"><br>
  <label for="lname">Last name:</label><br>
  <input type="text" id="lname" name="lname" value="Doe"><br><br>
  <input type="submit" value="Submit">
</form>

<button type="submit" form="form1" value="Submit">Submit</button>

  <label for="fname">First name:</label><br>
  <input type="text" id="fname" name="fname"><br>

<input type="submit">