Microbial fuel cells are electrochemical devices that produce electrical energy directly from various organic wastes due to the catalysis reactions of microorganisms.Chapter 1 offers information on the history of microbial fuel cells.Chapter 2 offers information on microbial fuel cells and their types, electricity generation, and other processes. Here, it is stated that microbial fuel cell studies are mostly related to Chemistry, Electrochemistry, Physics, Biology, Microbiology, Medicine, Engineering, Materials Science, Materials Engineering, Environmental Engineering Chemical Engineering, etc. science and technology issues.Chapter 3 offers information on the use areas of microbial fuel cells. Here, it has been stated that microbial fuel cells are used in wastewater cleaning, biological cleaning, biohydrogen production, biosensor applications, and implantable devices activities besides in bio and green electricity generation.Chapter 4 offers information on the place of microbial fuel cells in the world market.