The study and use of medicinal plants is known as herbal medicine. Plant-derived compounds are widely used in pharmaceutical drugs. Herbal medicines are prominently used for patients suffering from chronic diseases such as asthma, diabetes, etc. Herbal teas are the most common form in which herbs are consumed. Herbal teas can be classified as infusions and decoctions. The hot water extracts of herbs are referred to as infusions. Examples of herbs used in infusions are chamomile, mint, among other, etc. The cold infusion of high-mucilage plants is called maceration. The long-term boiled extracts of harder substances are called decoctions. Such substances include barks and roots. This book traces the progress of this field and highlights some of its key concepts and applications. While understanding the long-term perspectives of the topics, the book makes an effort in highlighting their impacts as a modern tool for the growth of the discipline. It includes contributions of experts and scientists which will provide innovative insights into this field.