Why the cyst is formed?

Explanation

### Step-by-Step Solution:

1. **Definition of Cysts**:
- Cysts are defined as enclosed sacs within body tissues that have distinct membranes and typically contain liquid material.

2. **Examples of Cyst Formation**:
- A common example is seen in parasitic worms, which develop cysts around their larval forms. This helps to protect the larvae during their development.

...