The seeds of a coffee plant (which are the pit of the coffee plant fruit) are known as coffee beans. Even though coffee beans are seeds, they are called beans because of their similarities.
Espresso Beans
Espresso beans are ground and used to make the coffee beverage we know as Espresso. Espresso beans are roasted, ground and then brewed by forcing hot pressurised water through a groove head.
Espresso beans are roasted specifically for the production of espresso coffee and are enjoyed worldwide.
Espresso beans have more caffeine per unit volume than most other coffee beverages. Espresso beans are not a specific bean as such but still categorised as espresso beans as they are primarily used to produce espresso style coffee via the use of an espresso machine.
In Italy espresso beans are roasted differently depending on the area. In Southern Italy darker roasted espresso beans are preferred compared to the far north of the country which locals tend to be more fond of lighter roasted espresso beans.
Espresso Coffee
Espresso coffee is a coffee beverage that is brewed by forcing hot water under pressure or pressurised steam through finely ground roasted coffee.
Espresso Coffee has more caffeine than most beverages. A double shot of espresso coffee (60ml) should have the same amount of caffeine as a standard cup of drip brewed coffee.
In coffee brewing terms, espresso coffee and brewed coffee should have the same extraction but espresso coffee has a higher brewing strength due to less water.