RNA editing is a critical post-transcriptional modification that alters RNA base pairs, playing a key role in various cellular processes. It occurs in two main forms: A-to-I editing, catalyzed by ADARs and ADATs, and C-to-U editing, catalyzed by APOBECs. ADARs are involved in editing double-stranded RNA and tRNA, while APOBECs edit cytosine to uridine in RNA. RNA editing influences innate immunity, cancer, and antiviral responses, and has potential applications in biotechnology and therapy. ADARs are crucial for modifying dsRNA structure and immunogenicity, and their dysfunction is linked to neurological disorders and autoimmune diseases. A-to-I editing is particularly important in the nervous system, while C-to-U editing is involved in viral defense and immune regulation. RNA editing can correct disease-causing mutations and is a promising tool for therapeutic applications. Recent advances in RNA editing tools, such as site-directed editing and light-triggered systems, have improved the precision and efficiency of RNA modifications. However, challenges remain in achieving high specificity, minimizing off-target effects, and optimizing delivery methods. RNA editing has significant implications for understanding disease mechanisms and developing targeted therapies. Future research aims to enhance RNA editing technologies, improve their clinical applicability, and explore their roles in various biological processes and diseases.RNA editing is a critical post-transcriptional modification that alters RNA base pairs, playing a key role in various cellular processes. It occurs in two main forms: A-to-I editing, catalyzed by ADARs and ADATs, and C-to-U editing, catalyzed by APOBECs. ADARs are involved in editing double-stranded RNA and tRNA, while APOBECs edit cytosine to uridine in RNA. RNA editing influences innate immunity, cancer, and antiviral responses, and has potential applications in biotechnology and therapy. ADARs are crucial for modifying dsRNA structure and immunogenicity, and their dysfunction is linked to neurological disorders and autoimmune diseases. A-to-I editing is particularly important in the nervous system, while C-to-U editing is involved in viral defense and immune regulation. RNA editing can correct disease-causing mutations and is a promising tool for therapeutic applications. Recent advances in RNA editing tools, such as site-directed editing and light-triggered systems, have improved the precision and efficiency of RNA modifications. However, challenges remain in achieving high specificity, minimizing off-target effects, and optimizing delivery methods. RNA editing has significant implications for understanding disease mechanisms and developing targeted therapies. Future research aims to enhance RNA editing technologies, improve their clinical applicability, and explore their roles in various biological processes and diseases.