Nucleoside-Analog-2 is widely used in antiviral therapies, particularly for treating infections caused by DNA and RNA viruses. It functions by mimicking natural nucleosides, integrating into viral DNA or RNA during replication, and terminating the chain elongation process. This mechanism effectively inhibits viral replication, making it a key component in medications for diseases such as hepatitis B, HIV, and herpesvirus infections. Additionally, it is being explored in cancer treatment due to its ability to interfere with the replication of rapidly dividing cancer cells. Research is ongoing to optimize its efficacy and reduce potential side effects in clinical applications.