Mycology is the study of fungi, their relationships to each other and other organisms, and the unique biochemistry which sets them apart from other groups. Fungi are eukaryotic organism which belong to their own kingdom. Until advances in DNA technology, it was assumed that fungi were an offshoot of the plant kingdom. DNA and biochemical analysis has revealed that fungi are a separate lineage of eukaryotes, distinguished by their unique cell wall made of chitin and glucans which often surrounds multinucleated cells. Mycology is a necessary branch of biology because fungi is considerably different from both plants and animals.Although we are not aware of it, fungi have a great impact in our daily habits, and our society and way of living would be very different in the absence of these organisms. Fungi are widely found in the environment, and they have multiple beneficial effects and applications. But these organisms are also the cause of devastating plagues and diseases, so their control is mandatory in agriculture and biomedicine. In this article, I will provide a brief overview of the impact of fungi in our life.