Reverse Auction Defined. You probably think you have a good understanding of how most auctions are done. For example, you may have bid on a product you found on eBay. If another person wants the same item you want, she may bid higher than you to get it. Of course, if you still want the item bad enough, you may bid higher yet.
Custom Data Types: Ability to Create them in Setup. I would like to create my own data type in SalesForce. When we create a New Field, we have to choose from the built in options for example, Date, AutoNum, Checkbox, Picklists, text, lookup, etc.
The data types that already exist are primitive types. User defined types are the objects of a class. The user defined data types are the reference types. See primitive data types means the ones like int, float, double, etc. Even the ones like BigInteger, ArrayList are all primitive types.