The next step is getting the part onto a schematic to connect it to other components and devices.
This is the purpose of 'symbols' in Eagle. Symbols are used as a visual representation of our physical part, including the individual pins or pads. They act as a conceptual bridge between the functional intent of our schematic and the physical or mechanical package itself.
Symbols are useful as an abstraction layer since we can have one symbol, for example for a resistor, with many packages associated with it (0402, 0603, 0805, 1206, etc.). By separating the two, we can easily change the physical package used on our board without changing the entire schematic.