How could you use biotechnology to protect a plant from insect damage

To protect plant form insect damage, I will make it into a transgenic plant. Transgenic plant are called genetically modified organisms (GMO) because there is a gene added or removed in the original plant to obtain a set of characteristic such as insect damage.

Biotechnology could be used to engineer plants with resistance to a certain pest so that on infection by the pest the plant releases cytotoxins which can specifically kill the pest and prevent damage to the plant.