Digital Banking and Financial Technology (FinTech) have grown rapidly in India and are gradually changing the financial sector landscape and behavior of the financial sector in India, more so in technologically advanced states like Karnataka. Against the backdrop of continuing financial sector reforms and policy thrust for increased digital financial inclusion, this study attempts to analyse the adoption and usage patterns of digital banking and FinTech services in Karnataka. The specific objectives of this study are to assess the growth in digital financial services like Unified Payments Interface (UPI), Mobile Banking, Digital Wallets, etc.; to identify the socio- economic and behavioral and other determinants of the adoption of these services, and; to examine their impact on financial inclusion and efficiency in transactions. The research design we utilized here is quantitative in nature, based on secondary and primary data sources. To capture trends in digital financial development, secondary data is collected from credible sources like Reserve Bank of India (RBI), National Payments Corporation of India (NPCI), and World Bank databases. A focused structured questionnaire is used to collect primary data and the sample was restricted to 150 respondents, chosen randomly from urban, semi-urban and rural parts of the Karnataka state using stratified random sampling technique. Statistical tools such as descriptive statistics, correlation analysis along with multiple regression models were used for analyzing the data in order to test the hypotheses developed. Empirical evidence demonstrates that digital literacy, income level and trust in digital platforms are three of the strongest positive drivers of FinTech adoption, while cybersecurity and data privacy risk factors are the biggest deterrents. It has also found that digital banking services, especially UPI-based transactions, increased access to finance, lowered transaction costs, enhanced efficiency and positively affect financial inclusion. However, very little of it is equally distributed, rural areas are hampered both due to lack of digital awareness and infrastructure. The paper closes by suggesting specific policy measures that must be adopted to bridge the digital divide, build robust cybersecurity infrastructure, and ensure growth of a sustainable FinTech ecosystem in an inclusive manner in Karnataka.