This article provides an overview of chemokines and their receptors, highlighting their roles in immune function, inflammation, and disease. Chemokines are small, secreted proteins that signal through G protein-coupled heptahelical receptors, primarily directing the migration of leukocytes. They play a central role in immune system development and homeostasis, and are involved in both protective and destructive immune and inflammatory responses. Chemokines can induce various types of migratory behavior, including chemotaxis, haptotaxis, and chemokinesis, as well as cell arrest or adhesion. Chemokine receptors on leukocytes can also regulate the biology of non-leukocytic cell types. Chemokines are classified into four subfamilies based on the arrangement of cysteine residues in their structure: CC, CXC, CX3C, and XC. They are produced with an N-terminal signal peptide that is removed once they are secreted. Some chemokines have extended C or N termini that can be proteolytically cleaved to enhance receptor activation. Chemokines can also form homodimers, heterodimers, and higher-order aggregates, which can influence their activity and interactions with receptors. Chemokine activity is influenced by post-translational modifications, interactions with the extracellular matrix (ECM), and binding to atypical chemokine receptors (ACKRs). These receptors can regulate chemokine localization and abundance. Chemokines are also affected by proteases, which can cleave chemokines and alter their activity. Proteases are key regulators of chemokine function, and their regulation can have therapeutic implications. Chemokine receptors are divided into conventional chemokine receptors (cCKRs) and atypical chemokine receptors (ACKRs). cCKRs are involved in directing leukocyte migration and other biological responses, while ACKRs regulate chemokine localization and abundance. Chemokine receptors can also be involved in other biological processes, including cell proliferation, survival, differentiation, and immune responses. The chemokine network plays a critical role in immune surveillance, development, and homeostasis. It is involved in the recruitment of leukocytes to sites of infection or inflammation, and in the regulation of immune responses. Chemokines are also involved in the development and function of various immune cells, including T cells, B cells, and dendritic cells. The chemokine network is also involved in the pathogenesis of various diseases, including autoimmunity, allergy, chronic inflammatory disease, atherosclerosis, and cancer. The chemokine network is complex, with a large number of interacting ligands, receptors, and regulatory proteins. It is essential for the development and function of the immune system, and for the maintenance of immune homeostasis. Despite the complexity of the chemokine network, there is a growing understanding of its role in health and disease, and there is increasing interest inThis article provides an overview of chemokines and their receptors, highlighting their roles in immune function, inflammation, and disease. Chemokines are small, secreted proteins that signal through G protein-coupled heptahelical receptors, primarily directing the migration of leukocytes. They play a central role in immune system development and homeostasis, and are involved in both protective and destructive immune and inflammatory responses. Chemokines can induce various types of migratory behavior, including chemotaxis, haptotaxis, and chemokinesis, as well as cell arrest or adhesion. Chemokine receptors on leukocytes can also regulate the biology of non-leukocytic cell types. Chemokines are classified into four subfamilies based on the arrangement of cysteine residues in their structure: CC, CXC, CX3C, and XC. They are produced with an N-terminal signal peptide that is removed once they are secreted. Some chemokines have extended C or N termini that can be proteolytically cleaved to enhance receptor activation. Chemokines can also form homodimers, heterodimers, and higher-order aggregates, which can influence their activity and interactions with receptors. Chemokine activity is influenced by post-translational modifications, interactions with the extracellular matrix (ECM), and binding to atypical chemokine receptors (ACKRs). These receptors can regulate chemokine localization and abundance. Chemokines are also affected by proteases, which can cleave chemokines and alter their activity. Proteases are key regulators of chemokine function, and their regulation can have therapeutic implications. Chemokine receptors are divided into conventional chemokine receptors (cCKRs) and atypical chemokine receptors (ACKRs). cCKRs are involved in directing leukocyte migration and other biological responses, while ACKRs regulate chemokine localization and abundance. Chemokine receptors can also be involved in other biological processes, including cell proliferation, survival, differentiation, and immune responses. The chemokine network plays a critical role in immune surveillance, development, and homeostasis. It is involved in the recruitment of leukocytes to sites of infection or inflammation, and in the regulation of immune responses. Chemokines are also involved in the development and function of various immune cells, including T cells, B cells, and dendritic cells. The chemokine network is also involved in the pathogenesis of various diseases, including autoimmunity, allergy, chronic inflammatory disease, atherosclerosis, and cancer. The chemokine network is complex, with a large number of interacting ligands, receptors, and regulatory proteins. It is essential for the development and function of the immune system, and for the maintenance of immune homeostasis. Despite the complexity of the chemokine network, there is a growing understanding of its role in health and disease, and there is increasing interest in