In addition to the template tags that Twig comes with, Craft provides a few of its own.

instance of

Returns whether an object is an instance of another object or class.

{% if element is instance of('craft\\elements\\Entry') %}
    <h1>{{ entry.title }}</h1>
{% endif %}


Returns whether a given object is an instance of craft\base\MissingComponentInterface, an interface used to represent components whose types are missing.

{% if field is missing %}
{% endif %}