Gene therapy is the extraction of genes into an individual's cells and tissue to treat diseases especially hereditary disease.

Answer

**Step-by-Step Solution:**

1. **Understanding Gene Therapy**: Gene therapy is a medical technique that involves modifying or manipulating genes to treat or prevent diseases, particularly genetic disorders.

2. **Identifying the Purpose**: The primary goal of gene therapy is to correct genetic disorders by replacing or repairing faulty genes. This is particularly relevant for hereditary diseases, which are caused by mutations in the genes passed from parents to offspring.

3. **Mechanism of Action**: In gene therapy, a healthy copy of a gene is introduced into the patient's cells. This can be done using various methods, such as viral vectors, which deliver the therapeutic gene into the target cells.

4. **Outcome of Gene Therapy**: By introducing the correct gene, the therapy aims to restore normal function to the affected cells, which can alleviate or eliminate the symptoms of the disease.

5. **Conclusion**: Since gene therapy involves the extraction and introduction of genes into an individual’s cells and tissues to treat diseases, especially hereditary diseases, the statement provided in the question is true.

**Final Answer**: True

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