What is active immunity?

Explanation

### Step-by-Step Text Solution

1. **Definition of Active Immunity**: Active immunity refers to the immunity that an individual develops in response to exposure to a pathogen or through vaccination. It involves the active participation of the immune system in producing antibodies.

2. **Acquired Immunity**: Active immunity is a type of acquired immunity, which means it is not present at birth but is developed throughout an individual's life. Acquired immunity is facilitated by lymphocytes, which are specialized white blood cells that play a crucial role in the immune response.

3. **Role of Lymphocytes**: There are two main types of lymphocytes involved in active immunity: T-cells and B-cells.
- **T-cells**: These cells help in recognizing pathogens. They can be further categorized into:
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