Nowadays, the ideas of environment preservation and sustainable development are very popular and unavoidable in developed countries. One of the ways to achieve these goals is an usage of biomass. Due to its availability and cost-effectiveness, biomass is used for producing chemicals which are applied in industry. As the need to use renewable energy sources increases, so does the use of biomass as an energy source. The main reason for this is increasingly higher usage of fossil fuels, which are harmful for environment due to emissions of greenhouse gasses that cause global warming. For this purpose, biomass can be converted by various processes into higher quality products, energy sources. Pyrolysis, as the process of thermal decomposition of organic and inorganic matter without the presence of oxygen, has proven to be a successful method. In this work, terms of pyrolysis and biomass are explained. The application of pyrolysis and biomass in industry is presented. Considering possibility to obtain various products by pyrolysis of biomass; the conditions in which certain type of products is obtainable and appropriate pyrolytic reactor for the each type is defined. According to the defined parameters of pyrolysis, the types of pyrolysis are explained, as well as the products that can be obtained in each type.