Entity Object Structure

This explains the C# Entity Object Structure. For an overview check out Understanding Data....

What follows is very technical. For most use cases you don't need to know this stuff.

Entities are structured as follows:

EAV+D = Entity-Attribute-Value + Dimension

EAV stands for Entity, Attribute, Value The D stands for Dimension, it says what Dimension (Language) a Value is for

ToSic.Eav.Data Namespace has almost everything you see here
IEntity describes the main unit, the Entity
IContentType defines what fields exist, it's the ContentType / Schema
IAttributeBase, IAttribute, IAttribute<T>, IAttribute<T> determine the internal model how an attribute is built
IValue, IValue<T>, determines how values in an attribute are stored, because an attribute like Description can have many values in different languages
ILanguage, IDimension, ILanguage languages and dimensions determine how the values are used in each language
, this determines if the Entity is by itself, or if it's enriching something else - in which case this Entity is Metadata.
IMetadataOf sometimes an Entity may itself have more metadata, which would then be stored here.