An echo chamber is an environment, often online, where people are primarily exposed to opinions and information that reflect and reinforce their own beliefs. This occurs when individuals or automated bots share similar perspectives, leading to the repetition and amplification of the same ideas. As a result, exposure to differing viewpoints is limited, which can strengthen biases and polarize opinions. Echo chambers are common on social media platforms, forums, and other digital communities, and they can impact public discourse, decision-making, and even cybersecurity by spreading misinformation or coordinated narratives.