The chapter discusses the complex responses of plants to herbivores, focusing on the activation of various signaling pathways and gene expression in response to different types of herbivores. Phloem-feeding insects like whiteflies and aphids, which cause minimal tissue damage, activate the salicylic acid (SA)-dependent and jasmonic acid (JA)/ethylene-dependent signaling pathways. These responses are species-specific and can be influenced by the herbivore's developmental stage. In contrast, chewing insects such as caterpillars and beetles, which cause more extensive tissue damage, activate wound-signaling pathways. The chapter also highlights the role of volatiles produced by plants as an indirect defense mechanism, attracting herbivore parasites and predators. The balance between constitutive and induced defenses is crucial for plants to survive and reproduce, with the choice of defense chemicals depending on the herbivore species and feeding mode. The review emphasizes the recent literature on plant responses to non-chewing insects, detailing how these insects induce specific pathways and elicit plant defenses and wound responses.The chapter discusses the complex responses of plants to herbivores, focusing on the activation of various signaling pathways and gene expression in response to different types of herbivores. Phloem-feeding insects like whiteflies and aphids, which cause minimal tissue damage, activate the salicylic acid (SA)-dependent and jasmonic acid (JA)/ethylene-dependent signaling pathways. These responses are species-specific and can be influenced by the herbivore's developmental stage. In contrast, chewing insects such as caterpillars and beetles, which cause more extensive tissue damage, activate wound-signaling pathways. The chapter also highlights the role of volatiles produced by plants as an indirect defense mechanism, attracting herbivore parasites and predators. The balance between constitutive and induced defenses is crucial for plants to survive and reproduce, with the choice of defense chemicals depending on the herbivore species and feeding mode. The review emphasizes the recent literature on plant responses to non-chewing insects, detailing how these insects induce specific pathways and elicit plant defenses and wound responses.