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Umbraco Forms is a package that you can install on your Umbraco website, to have a nice integrated UI where you can create forms for your website.
In this video you can get an introduction to Umbraco Forms as well as an overview of the rest of the Forms playlist.
You can purchase an Umbraco Forms license from our website: https://umbraco.com/products/umbraco-forms/
With the Umbraco HQ's add-on product Umbraco Forms it's a breeze to create any type of form you can imagine.Read documentation