Now a day the rapid growth of the Internet of Things (IoT) has made everyday devices like smart homes, wearable gadgets, and connected vehicles more useful and efficient. However, this connectivity also brings serious security and privacy challenges. This research paper explores the common threats faced by IoT networks and discusses possible ways to reduce these risks. IoT devices often have limited processing power and weak security features, making them easy targets for cyberattacks. Common threats include unauthorized access, data theft, malware attacks, and denial-of-service (DoS) attacks, where systems are overloaded and stop working. In many cases, sensitive user data such as personal information, location, and daily habits can be exposed if proper protection is not in place. Another major concern is privacy. Since IoT devices constantly collect and share data, users may lose control over how their information is used. Weak authentication methods and lack of encryption can allow attackers to intercept or misuse this data. To address these issues, the paper suggests several countermeasures. Strong authentication methods, such as multi-factor authentication, can help ensure that only authorized users access devices. Data encryption is essential to protect information during transmission. Regular software updates and security patches can fix known vulnerabilities. Network monitoring and intrusion detection systems can help identify suspicious activities early. Additionally, designing IoT systems with security in mind from the beginning—known as “security by design”—is crucial. Educating users about safe practices, such as using strong passwords and updating devices, also plays an important role. In conclusion, while IoT networks offer many benefits, they also introduce new risks. By understanding these threats and applying proper security measures, it is possible to build safer and more reliable IoT systems.