A detailed introductory account based on sexually transmitted infections (STIs) has been presented in this profound book. Sexually transmitted infections are infections that are spread primarily through sexual contact between two people. There are nearly 30 distinct sexually transferrable microbes and parasites that are known to humankind. STIs lead to high morbidity and complications. This book presents essential information for general reference work of doctors, experts and students associated with this sphere. The topics covered consist of enough information helpful to common readers as well. It also provides an overview with particular focus on syndromic approach to the management of STIs in clinical setting.