A product is something that you bill to a client. A product could be a computer, a set of icons or a monthly fee for website hosting services. You should use a product whenever you want to bill something to a client that is neither a task nor an expense.

You can add a product to a project and bill it later or add it directly to an invoice in the New Invoice window.

Go to Business » My Business Details+Catalog to create a list of the products sold by your business. Catalog items make it easier to create new products.

For instance, if you are a web-designer you could define a product called Hosting that is charged $10/month. If you create a new product based on Hosting, that product is automatically configured to by billed at a rate of $10/month.