Tissues:

* Definition: A group of similar cells that work together to perform a specific function. Imagine a team of workers all doing the same job!

* Examples:

* Muscle tissue: Contracts and relaxes to allow movement.

* Nervous tissue: Sends and receives signals throughout the body.

* Connective tissue: Supports and connects other tissues, like bone and cartilage.

* Epithelial tissue: Forms linings and coverings, like skin.

Organs:

* Definition: A structure made up of two or more different tissues that work together to perform a more complex function. Think of a team of teams, each doing their part to achieve a larger goal!

* Examples:

* Heart: Composed of muscle tissue, nervous tissue, and connective tissue to pump blood.

* Stomach: Made of muscle tissue, epithelial tissue, and connective tissue to digest food.

* Brain: Made of nervous tissue to control thoughts, emotions, and bodily functions.

* Lungs: Composed of epithelial tissue, connective tissue, and muscle tissue to exchange gases.

Key Differences:

* Complexity: Tissues are simpler, while organs are more complex structures.

* Function: Tissues perform specific tasks, while organs carry out more complex functions.

* Composition: Tissues are made of similar cells, while organs are made of different tissues working together.

Think of it like this:

* Brick: A single cell

* Wall: A tissue (many bricks together)

* House: An organ (walls, roof, floors, etc. working together)