The common cold is caused by over 250 different viruses. It is different from the flu.
Here's an excerpt from Webmd
Although the flu and the common cold are both respiratory illnesses, they are caused by different viruses. Because they have similar symptoms, it can be difficult to tell them apart. But generally cold symptoms are much milder than flu.
Common cold symptoms include:
Sore throat
Stuffy nose
Runny nose
Cough
Mild fever
The flu, on the other hand, often causes higher fever, chills, body ache, and fatigue.