Fields
Fields are like columns in a database. They belong to an object and have a name, label for display purposes, and constraints such as data type and uniqueness.
In Force.com, there are two categories of fields: standard and custom. Standard fields are fields that are created by Force.com for its own internal use, but are also available to users. They can be hidden from view and unused, but not completely removed or redefined. They are a part of the Force.com data model that is static, relied on to exist by other layers of Force.com technology. Examples of standard fields are Id (unique identifier) and Created By (the user who created the record). Custom fields are created by you, the developer, to store data specific to your applications. ...
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