The Records Browser defines the schema for all scriptable record types; it is an extremely critical reference tool for every SuiteScript developer. When you need to know how to reference a particular field on a specific record type in your script, the Records Browser is your guide.
You may also notice tabs at the top of the Records Browser for Schema Browser and Connect Browser. These are very similar to the Records Browser, but for different NetSuite APIs.
The Schema Browser provides the schema for the SOAP-based Web Services API, while the Connect Browser provides the schema for the ODBC connector.