1. Fungi as Hidden Partners of Plants: An Introduction 2. Diversity, Phylogeny, and Taxonomic of Endophytic Fungal Communities 3. Endophytic Fungal Diversity: Review of Traditional and Molecular Techniques 4. "Omics" Tools for Better Understanding the Plant-Endophyte Interactions 5. Plant Growth-Promoting Potentials of Endophytic Fungi 6. Molecular Approaches to Screen Bioactive Compounds from Endophytic Fungi 7. In Silico Prediction and Characterization of Secondary Metabolite from Endophytic Fungi 8. The Insecticidal Activity of Endophytic Fungi for Sustainable Agriculture 9. Bioactive Compounds of Endophytic Fungi for Diverse Biotechnological Applications 10. Industrially Important Enzymes of Endophytic Fungi 11. The Alpha-Amylase Inhibition Potential of Endophytic Fungi 12. Antimycobacterial Compounds Produced by Endophytic Fungi: An Overview 13. Secondary Metabolites Production by Endophytic Fungi 14. Endophytic Fungi-Alternative Sources of Cytotoxic Compounds 15. Volatile Organic Compounds from Endophytic Fungi 16. Anticancer and Antimicrobial Potential of Fungal Endophytes from Medicinal Plants 17. Fungal Endophytes as Novel Sources of Antirheumatoid Compounds 18. Fungal Endophytes as Novel Sources of Antioxidant Compounds 19. Alkaloids of Fungal Endophytes, Diversity and Therapeutic Applications 20. Acetylcholinesterase Inhibitory Potential of Endophytic Fungi 21. Fungal Secondary Metabolism: Regulation, Function and Drug Discovery 22. Endophytic Fungi from the Lab to the Factory: Biostimulants Recent Developments 23. Fungi as an Unseen Heritage and Wealth: Conclusion and Future Challenges