This review discusses the production of hydrogen from biomass through pyrolysis and gasification. It analyzes over 15 types of terrestrial and marine biomasses, focusing on the thermochemical processes of pyrolysis and gasification, which are identified as the most effective methods for producing hydrogen from biomass. The article covers catalysts, solid residues, and residual water used in biohydrogen production. It also discusses the potential of hydrogen as an energy source with significant short-term benefits for replacing fossil fuels. Hydrogen is used in various industries as a raw material. While it is produced from non-renewable sources like hydrocarbons, the article highlights the potential of renewable sources for hydrogen production. The review discusses various methods for generating hydrogen, including electrolysis, biophotolysis, dark fermentation, and photofermentation. It also explores the use of biomass through thermochemical processes such as pyrolysis, gasification, and combustion. Pyrolysis is a thermal process that converts biomass into valuable products, including hydrogen. It is carried out in an inert atmosphere and can produce volatile substances like oil, carbon, gases, and hydrogen. The hydrogen yield depends on factors such as the type of biomass, temperature, and catalysts used. Fast pyrolysis, which involves high temperatures, can produce higher hydrogen yields. The review also discusses the use of catalysts like nickel, calcium, and others to enhance hydrogen production. Gasification is another method for producing hydrogen from biomass. It involves converting solid biomass into a combustible gas through high-temperature reactions. The efficiency of gasification depends on factors such as the type of biomass, temperature, and the composition of the gasification agents. The review highlights the potential of gasification for producing hydrogen with higher efficiency compared to pyrolysis in some cases. The review also discusses the use of marine biomass, such as algae, for hydrogen production. Algae have high productivity and photosynthetic efficiency, making them a promising source for hydrogen generation. The review explores the use of catalysts like calcium oxide and nickel to enhance hydrogen production from algae. The review concludes that hydrogen has significant potential as an energy source, with the ability to replace fossil fuels and contribute to a sustainable energy system. It emphasizes the importance of further research and development in hydrogen production methods to improve efficiency and reduce costs. The review also highlights the need for policies and support to promote the growth of the hydrogen energy sector.This review discusses the production of hydrogen from biomass through pyrolysis and gasification. It analyzes over 15 types of terrestrial and marine biomasses, focusing on the thermochemical processes of pyrolysis and gasification, which are identified as the most effective methods for producing hydrogen from biomass. The article covers catalysts, solid residues, and residual water used in biohydrogen production. It also discusses the potential of hydrogen as an energy source with significant short-term benefits for replacing fossil fuels. Hydrogen is used in various industries as a raw material. While it is produced from non-renewable sources like hydrocarbons, the article highlights the potential of renewable sources for hydrogen production. The review discusses various methods for generating hydrogen, including electrolysis, biophotolysis, dark fermentation, and photofermentation. It also explores the use of biomass through thermochemical processes such as pyrolysis, gasification, and combustion. Pyrolysis is a thermal process that converts biomass into valuable products, including hydrogen. It is carried out in an inert atmosphere and can produce volatile substances like oil, carbon, gases, and hydrogen. The hydrogen yield depends on factors such as the type of biomass, temperature, and catalysts used. Fast pyrolysis, which involves high temperatures, can produce higher hydrogen yields. The review also discusses the use of catalysts like nickel, calcium, and others to enhance hydrogen production. Gasification is another method for producing hydrogen from biomass. It involves converting solid biomass into a combustible gas through high-temperature reactions. The efficiency of gasification depends on factors such as the type of biomass, temperature, and the composition of the gasification agents. The review highlights the potential of gasification for producing hydrogen with higher efficiency compared to pyrolysis in some cases. The review also discusses the use of marine biomass, such as algae, for hydrogen production. Algae have high productivity and photosynthetic efficiency, making them a promising source for hydrogen generation. The review explores the use of catalysts like calcium oxide and nickel to enhance hydrogen production from algae. The review concludes that hydrogen has significant potential as an energy source, with the ability to replace fossil fuels and contribute to a sustainable energy system. It emphasizes the importance of further research and development in hydrogen production methods to improve efficiency and reduce costs. The review also highlights the need for policies and support to promote the growth of the hydrogen energy sector.