You can easily remember your birth date; perhaps you can also remember what you did on your last birthday. The difference between these two pieces of knowledge can best be characterized as a difference between:

Semantic vs. Episodic Memory

Explanation:

Semantic memory is an organized record of knowledge, meanings, facts and concepts about the world. Semantic is about simple knowledge, which includes types of dress, food, social etiquette, etc.

Episodic memory is about our memory of a person's experiences of specific events or incidents in time in a serial form. This memory is autobiographical in nature and includes places, times, and emotions.

In this case, remembering birth day is semantic memory while what actually happened on the last birth day is episodic memory.