What is CodeIgniter 4's Form helper?

The Form helper in CI4 provides functions for generating HTML form elements. Load it: helper("form"). form_open("users/save", ["method" => "post"]) opens a form tag with the URL and method. form_close() closes it. form_input(["name" => "username", "value" => $username, "placeholder" => "Enter username"]) creates an input. form_password("password"), form_textarea("bio", $bio, ["rows" => 4]), form_dropdown("role", $options, $selected), form_radio("gender", "male", true), form_checkbox("agree", "yes", $agreed). form_submit("submit", "Save") creates a submit button. form_hidden("id", $id) creates hidden fields. The helper also includes set_value("field", "default") for repopulating form data after validation failure, and form_error("field") to display validation errors inline.