The rapid expansion of the Internet and advances in digital technology have revolutionized traditional banking methods, leading to the emergence of online banking. Online banking enables customers to conduct financial transactions anywhere, anytime, with unprecedented convenience and accessibility. This paper provides a comprehensive analysis of online banking, examining its benefits, challenges and impact on both banks and consumers. Key aspects such as security concerns, customer satisfaction, cost effectiveness and complexity in implementing online banking systems are discussed. Also, how online banking is reshaping the banking landscape, promoting greater competition, financial inclusion and digital transformation in the global economy. The advent of the Internet and digital technologies has fundamentally changed the way financial institutions operate, paving the way for online banking. Online banking, also referred to as internet or e-banking, allows customers to access a wide range of financial services through digital platforms. These services include checking account balances, transferring funds, paying bills and managing investments all from the convenience of a personal device. As customers increasingly demand fast, convenient and secure banking services, financial institutions have responded by embracing digital transformation. The shift to online banking has brought significant benefits such as reduced operational costs, improved customer experience and increased efficiency in financial services. However, along with these advantages, banks also face challenges related to cyber security, customer trust and the need for continuous technological upgrades to meet evolving consumer needs. The importance of research related to online banking lies in its profound impact on the global financial system and its growing relevance in the digital age. Understanding online banking is important for financial institutions, regulators and customers as it changes traditional banking practices and introduces new opportunities and challenges. Technological Advances and Innovations: Online banking is at the forefront of financial technology (FinTech), creating innovations in service delivery. Exploring this area allows for a deeper understanding of how technological advances such as mobile banking, artificial intelligence (AI) and block chain are improving efficiency, customer experience and the competitive landscape of banking institutions. Customer Behavior and Satisfaction: As more consumers shift to digital platforms, research on online banking provides insights into changing customer expectations and behavior. It highlights key factors influencing customer satisfaction, including usability, convenience and trust, helping banks refine their services to meet growing demands for seamless, personalized experiences. Cost Efficiency and Operational Impact: The financial sector has experienced significant cost reductions and operational improvements through the adoption of online banking. Understanding how banks can use online platforms to optimize resource allocation, reduce transaction costs and improve efficiency is critical for stakeholders looking to stay competitive and increase profitability. Security and risk management: As online banking systems become more pervasive, so do the associated risks—especially those related to cyber security. Research in this domain is essential for developing effective security protocols, understanding fraud prevention strategies, and managing data privacy concerns. It ensures continuous improvement of security measures to protect both financial institutions and consumers. Customer Satisfaction (Benefit), Transaction Speed (Benefit, sec), Implementation Cost (Non-Benefit, $000), Security Rating (Non-Benefit). System A, System B, System C, System D, System E.