Graphene nanoribbons (GNRs) are narrow strips of graphene with widths ranging from a few nanometers to tens of nanometers. They possess many of graphene's excellent properties and exhibit unique characteristics such as adjustable band gaps and spin-polarized edge states, making them promising for carbon-based electronics. This review discusses the edge geometry and electronic band structure of GNRs, various fabrication methods, and their applications in field-effect transistors, quantum dots, and spintronic devices. GNRs can be fabricated using top-down methods like lithography and etching, or bottom-up methods such as on-surface polymerization and templated CVD. The performance of GNR-based devices depends on their edge type, width, and fabrication method. GNRs with zigzag edges show potential for spintronic applications due to their magnetic properties. Challenges in GNR fabrication include achieving precise control over their structure and properties. Opportunities include their use in next-generation electronics and spintronics. The review highlights the importance of GNRs in advancing nanoelectronics and spintronics, and suggests further research into their unique properties and applications.Graphene nanoribbons (GNRs) are narrow strips of graphene with widths ranging from a few nanometers to tens of nanometers. They possess many of graphene's excellent properties and exhibit unique characteristics such as adjustable band gaps and spin-polarized edge states, making them promising for carbon-based electronics. This review discusses the edge geometry and electronic band structure of GNRs, various fabrication methods, and their applications in field-effect transistors, quantum dots, and spintronic devices. GNRs can be fabricated using top-down methods like lithography and etching, or bottom-up methods such as on-surface polymerization and templated CVD. The performance of GNR-based devices depends on their edge type, width, and fabrication method. GNRs with zigzag edges show potential for spintronic applications due to their magnetic properties. Challenges in GNR fabrication include achieving precise control over their structure and properties. Opportunities include their use in next-generation electronics and spintronics. The review highlights the importance of GNRs in advancing nanoelectronics and spintronics, and suggests further research into their unique properties and applications.