Plant immunity refers to the ability of plants to defend themselves against pathogens, such as bacteria, fungi, and viruses. This defense system involves two main types of responses: innate immunity, which provides a general defense against a wide range of threats, and adaptive immunity, which allows plants to develop specific responses to particular pathogens they have encountered before. Plants utilize various mechanisms to recognize and respond to infections. These include physical barriers, like thick cell walls, and chemical responses, such as the production of antimicrobial compounds. Additionally, plants can activate signaling pathways that enhance their overall resistance, making them more resilient to future attacks from pathogens.