Define the term vector with reference to genetic engineering.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Vector**: In the context of genetic engineering, a vector is defined as a DNA molecule that is used to carry foreign DNA or a gene of interest into a host cell.

2. **Types of Vectors**: Vectors can take various forms, including:
- **Plasmids**: Circular DNA molecules found in bacteria that can replicate independently.
- **Bacteriophages**: Viruses that infect bacteria and can be used to transfer genetic material.
- **Acosmids**: Hybrid vectors that combine features of plasmids and bacteriophages.
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