What are stem cells? Where are they located in human body? What is their importance?

Explanation

### Step-by-Step Solution:

1. **Definition of Stem Cells**:
- Stem cells are undifferentiated cells that have the unique ability to develop into various types of cells in the body. They can divide and replicate themselves and can differentiate into specialized cells, such as muscle cells, nerve cells, or blood cells.

2. **Location of Stem Cells in the Human Body**:
- In adults, stem cells are primarily found in specific tissues. Key locations include:
- **Bone Marrow**: This is a major source of hematopoietic stem cells, which give rise to blood cells.
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