Here's a breakdown of the key components:

* Distinct Structure: An organ has a recognizable shape and arrangement of tissues, setting it apart from surrounding structures.

* Multiple Tissues: An organ is not made of just one type of tissue. It's a combination of different tissues, such as epithelial, connective, muscular, and nervous tissues, each contributing to its overall function.

* Specific Function: Each organ has a unique role to play in the body's overall functioning. For example, the heart pumps blood, the lungs facilitate gas exchange, and the stomach breaks down food.

Here are some examples of organs in the human body:

* Heart: Pumps blood throughout the body.

* Lungs: Exchange oxygen and carbon dioxide.

* Stomach: Digests food.

* Brain: Controls thoughts, emotions, and bodily functions.

* Liver: Filters blood and produces bile.

* Kidneys: Filter waste products from blood and produce urine.

Important Notes:

* Organs are not the same as cells or tissues. Cells are the basic building blocks of life, and tissues are groups of similar cells working together. Organs are made up of multiple tissues.

* The level of organization in biology progresses from cells to tissues to organs to organ systems to the whole organism.

* The definition of an "organ" can be a bit fluid. Some structures, like the pancreas, can be considered both an organ and a gland, depending on the context.