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Entity Particle  Represents each element of a field that can be presented in a user interface. Contrast EntityParticle with FieldDefinition, which represents each element of a field defined in the Metadata API. EntityParticle has parity with describe, which returns API-accessible fields only for an entity. EntityParticle Let's say there is a requirement to fetch all picklist fields along their label, API Name. SOQL query using Entity Particle  SELECT EntityParticle.DeveloperName, Label, Value, IsActive, EntityParticle.IsDependentPicklist, EntityParticle.FieldDefinition.ControllingFieldDefinition.DeveloperName FROM  PicklistValueInfo  WHERE EntityParticle.EntityDefinition.QualifiedApiName = 'Case'  AND EntityParticle.IsDependentPicklist = TRUE  ORDER BY EntityParticleId, Label Results Retrieve all the fields of the 'Phone' data type

EntityLimit EntityLimit is used to retrieve Limits displayed in the Setup UI for an object. EntityLimit Considerations SOQL Limitations SOSL Limitations Here's an example to retrieve the limits of an Object