What do you mean by ductless glands?

Explanation

**Step-by-Step Solution:**

1. **Understanding Glands**: A gland is defined as a cell, tissue, or organ that produces and secretes substances. These substances can be hormones, enzymes, or other fluids.

2. **Types of Secretion**: Glands can secrete substances in two main ways:
- **Into the Bloodstream**: This type of secretion does not require any ducts.
- **Outside the Bloodstream**: This type of secretion requires ducts to transport the substances to their target areas.

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