To determine whether a website or app is suspicious, there are several factors to consider. Firstly, check the URL for any misspellings or unusual characters, as this may indicate a fake website designed to steal personal information. Additionally, look for trust indicators such as SSL/TLS certificates and privacy policies that clearly outline data collection and usage practices. It's also important to review user reviews and ratings before downloading an app from an app store. If an app has numerous negative reviews or reports of malware infections, it should be avoided. Lastly, be cautious of pop-up ads or unsolicited email attachments that may contain malicious links or software. By staying vigilant and taking these precautions, individuals can help protect themselves against suspicious websites and apps that could potentially harm their devices and compromise their sensitive data.