As its name implies, a core record is a type of record that is central to Dynamics CRM. These record types may or may not be used, depending on the organization's needs. A marketing list is a group of three core record types: accounts, contacts, or leads. A few examples are a marketing list consisting of accounts with an address in the United States, contacts that belong to a company with an address in the United States, or leads entered into Dynamics CRM as a result of a recent trade show. A marketing list can only have one type of core record and that type is set at the time of creation of the list.
A lead represents a prospective customer that a user can qualify or disqualify. These leads may come from website enquiry forms, trade shows, conventions, and so on.
Accounts are essentially other organizations that your company has a business relationship with.
Contacts represent individuals that your organization has a relationship with. These...