Transition metal carbides (TMCs) and nitrides (TMNs) are promising materials for energy storage and conversion due to their high melting points, electrical conductivity, and chemical stability. This review summarizes recent advances in the synthesis and electrochemical applications of TMCs and TMNs in batteries, supercapacitors, and electrocatalytic reactions. Their properties, such as crystal structure, morphology, and composition, significantly influence their performance. Nanostructured materials like 2D MXenes offer advantages in terms of surface area and reactivity. Future research aims to design high-performance TMCs and TMNs for energy storage and electrocatalysis. Fuel cells, though promising, face challenges due to the high cost and unreliability of platinum-based catalysts. Non-precious alternatives are being explored for commercial applications. Energy storage systems, including lithium-ion, sodium-ion batteries, and supercapacitors, rely on advanced electrode materials. TMCs and TMNs are attractive due to their high theoretical capacities, chemical stability, and electrochemical properties. They are also being studied for electrocatalytic reactions such as oxygen reduction, oxygen evolution, and hydrogen evolution. TMCs and TMNs have unique properties, including high mechanical strength, good ionic and electronic conductivity, and resistance to corrosion. They differ from other transition metal compounds like TMDs and TMOs in their interstitial alloy structure. Recent developments include the synthesis of 2D MXene materials, which show high volumetric capacitance and cycling stability. TMCs and TMNs are also being explored for their catalytic properties, with examples like MoN showing promise in hydrogen evolution reactions. Various synthesis methods, including solid-state reactions, gas-solid reactions, and template methods, are used to produce TMCs and TMNs. These methods allow for the creation of nanostructured materials with tailored properties. For example, titanium carbide can be synthesized via low-temperature co-reduction or sol-gel processes. Molybdenum carbides and nitrides are synthesized using ammonia reduction and CVD techniques. Tungsten carbides and nitrides are also synthesized through high-temperature reactions and ammonia reduction. Titanium nitrides are prepared via CVD and ammonia reduction, while vanadium and molybdenum nitrides are synthesized using combustion and ammonia reduction methods. These materials are being developed for various applications, including supercapacitors, batteries, and electrocatalysis. Their unique properties make them promising candidates for next-generation energy storage and conversion technologies. Ongoing research focuses on improving their performance, stability, and scalability for practical applications.Transition metal carbides (TMCs) and nitrides (TMNs) are promising materials for energy storage and conversion due to their high melting points, electrical conductivity, and chemical stability. This review summarizes recent advances in the synthesis and electrochemical applications of TMCs and TMNs in batteries, supercapacitors, and electrocatalytic reactions. Their properties, such as crystal structure, morphology, and composition, significantly influence their performance. Nanostructured materials like 2D MXenes offer advantages in terms of surface area and reactivity. Future research aims to design high-performance TMCs and TMNs for energy storage and electrocatalysis. Fuel cells, though promising, face challenges due to the high cost and unreliability of platinum-based catalysts. Non-precious alternatives are being explored for commercial applications. Energy storage systems, including lithium-ion, sodium-ion batteries, and supercapacitors, rely on advanced electrode materials. TMCs and TMNs are attractive due to their high theoretical capacities, chemical stability, and electrochemical properties. They are also being studied for electrocatalytic reactions such as oxygen reduction, oxygen evolution, and hydrogen evolution. TMCs and TMNs have unique properties, including high mechanical strength, good ionic and electronic conductivity, and resistance to corrosion. They differ from other transition metal compounds like TMDs and TMOs in their interstitial alloy structure. Recent developments include the synthesis of 2D MXene materials, which show high volumetric capacitance and cycling stability. TMCs and TMNs are also being explored for their catalytic properties, with examples like MoN showing promise in hydrogen evolution reactions. Various synthesis methods, including solid-state reactions, gas-solid reactions, and template methods, are used to produce TMCs and TMNs. These methods allow for the creation of nanostructured materials with tailored properties. For example, titanium carbide can be synthesized via low-temperature co-reduction or sol-gel processes. Molybdenum carbides and nitrides are synthesized using ammonia reduction and CVD techniques. Tungsten carbides and nitrides are also synthesized through high-temperature reactions and ammonia reduction. Titanium nitrides are prepared via CVD and ammonia reduction, while vanadium and molybdenum nitrides are synthesized using combustion and ammonia reduction methods. These materials are being developed for various applications, including supercapacitors, batteries, and electrocatalysis. Their unique properties make them promising candidates for next-generation energy storage and conversion technologies. Ongoing research focuses on improving their performance, stability, and scalability for practical applications.