When pushed for a simple answer I once replied….
“marketing is finding out what we don't have and sales is the task of selling what we do”
Someone else more elegantly put it...
“marketing is the cost effective delivery of sales”
The term "sales and marketing" is used so commonly that it is assumed that they are one and the same by many people - they are not. Our definition for sales is the activity of taking a lead and selling the item desired. Our definition for marketing is the activity of finding out what the market wants to buy.
That's our sales and marketing definition - hope it helps.