Book excerpt: Over the years, the uses and applications of various non-conventional solvents such as ionic liquids, deep eutectic solvents, crown ethers, fluorinated solvents, glycols, glycerol etc diversified in various fields. This book consists of nine chapters, which present recent advances and outlook on various non-conventional solvents in organic transformations. Comparison between traditional solvents and non-conventional solvents are also highlighted in this book.