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The following field types are provided by the core system and core modules (many more are provided by contributed modules):
Boolean, Number (provided by the core system): Stores true/false values and numbers
Comment (provided by the core Comment module): Allows users to add comments to an entity
Date, Timestamp (Datetime module): Stores dates and times
Date range (Datetime range module): Stores time/date periods with a start and an end
Email (core system): Stores email addresses
Link (Link module): Stores URLs and link text
List (Options module): Stores values chosen from pre-defined lists, where the values can be numbers or text; see section below for more on list fields.
Reference (core system): Stores entity references; see section above
Telephone (Telephone module): Stores telephone numbers
Text (Text module): Stores formatted and unformatted text; see section below for more on text fields.
What settings are available for List field types?
List fields associate pre-defined <em>keys</em> (or value codes) with <em>labels</em> that the user sees. For example, you might define a list field that shows the user the names of several locations, while behind the scenes a location code is stored in the database. Each list field type corresponds to one type of stored key. For example, a <em>List (integer)</em> field stores integers, while the <em>List (text)</em> field stores text strings. Once you have chosen the field type, the main setting for a list field is the <em>Allowed values</em> list, which associates the keys with the labels.
What types of Text fields are available?
There are several types of text fields, with different characteristics. Text fields can be either <em>plain</em> or <em>formatted</em>: plain text fields do not contain HTML, while formatted fields can contain HTML and are processed through <em>text filters</em> (these are provided by the core Filter module; if you have that module enabled, see the related topic below on filters for more information). Text fields can also be regular-length (with a limit of 255 characters) or <em>long</em> (with a very large character limit), and long formatted text fields can include a <em>summary</em> attribute. All possible combinations of these characteristics exist as text field types; for example, <em>Text (plain)</em> and <em>Text (formatted, long, with summary)</em> are two examples of text field types.
What is a formatter?
A <em>formatter</em> is a way to display a field; most field types offer several types of formatters, and most formatters have settings that further define how the field is displayed. It is also possible to completely hide a field from display, and you have the option of showing or hiding the field's label when it is displayed.
What is a widget?
A <em>widget</em> is a way to edit a field. Some field types, such as plain text single-line fields, have only one widget available (in this case, a single-line text input field). Other field types offer choices for the widget; for example, single-valued <em>List</em> fields can use a <em>Select</em> or <em>Radio button</em> widget for editing. Many widget types have settings that further define how the field can be edited.
Managing content structure overview
Besides the field modules listed in the previous section, there are additional core modules that you can use to manage your content structure:
The core Node, Comment, Content Block, Custom Menu Links, User, File, Image, Media, Taxonomy, and Contact modules all provide content entity types.
The core Field UI module provides a user interface for managing fields and their display on entities.
The core Layout Builder module provides a more flexible user interface for configuring the display of entities.
The core Filter, Responsive Image, and Path modules provide settings and display options for entities and fields.
Depending on the core and contributed modules that you currently have installed on your site, the related topics below and other topics listed on the main help page (see @help_link) will help you with tasks related to content structure.
<a href="https://www.drupal.org/docs/user_guide/en/planning-chapter.html">Planning your Site (Drupal User Guide)</a>
<a href="https://www.drupal.org/docs/user_guide/en/structure-reference-fields.html">Concept: Reference Fields (Drupal User Guide)</a>
Add a field to an entity sub-type; see @content_structure_topic for an overview of entity types and sub-types, as well as an overview of field types.
In <em>Add a new field</em>, select the type of field you want to add; see @content_structure_topic for an overview of field types.