What is a Field Type in Craft CMS?

A field type is a type of input field that you use to cre­ate Pub­lish Lay­outs for your Craft CMS project. A field type is not just an HTML ele­ment, like an input field, textarea, or select. 

Field types in Craft can be any of those, but what makes a field type a Craft CMS field type is the HTML ele­ment it uses plus the func­tion­al­i­ty it pro­vides. The field type you choose will deter­mine the UI and the kind of data that it can store.

As an exam­ple, with the HTML ele­ment select. On its own, it allows you to select one item from a list of many via a sim­ple touch­able or click­able interface.

The in-built ver­sion of this in Craft is the Drop­down Field. It func­tions just like a select ele­ment, but Craft gives you the abil­i­ty to cre­ate a new instance of the Drop­down field and set the options via a set­ting UI in the Craft con­trol panel. 

You can then use the Drop­down Field in a Craft pub­lish lay­out to col­lect infor­ma­tion for a Craft ele­ment, like an entry, cat­e­go­ry, or asset. 

Addi­tion­al­ly, when you want to query for an ele­ment that has the Drop­down field you cre­at­ed and dis­play it in a Twig tem­plate, Craft pro­vides ways to access the data stored by that instance of the field.