Customer Relationship Management is a strategy for businesses whereas Electronic Customer Relationship Management is the toolkit used to make that strategy work. When you build something, you often have a blueprint of how it should look. Then, you use tools to make your pile of random parts turn into the design from the blueprint. The toolkit in this case is the eCRM. Destination CRM describes this in further detail.

Source: http://www.destinationcrm.com/Articles/ReadArticle.aspx?ArticleID=45833