What are the Differences in K-cups

For new Keurig owners and even those that have had a machine for a while, some k-cup definitions can be confusing.    Here are the basics.   

K-cup strength: 
K-cups come in two strengths, regular and Bold (or Exrtra Bold).  

Regular:                       8 to 9 grams of coffee per k-cup
Bold / Extra-Bold:      11 to 12 grams of coffee per k-cup

More coffee per k-cup equal a Bold or Extra-Bold experience. 

Roast:
Mild / Light - usually a coffee enjoyed at breakfast.  The description of mild really does fit the flavor.   Mild and light roast coffees generally have the most caffeine.
Medium / Full - a bit darker, fuller roast.  More flavorful and richer in taste.
Dark - Dark roast coffees will be darkest in the cup and have the deepest flavor, especially when using a bold k-cup.