How can anyone monitor your smartphone/computer remotely?

[neku]

While government agencies can monitor the online activities of any citizen or resident, is it possible for a person to monitor all the computer/mobile activities of another private citizen remotely, without giving the person permission?

 

[gwolf666]

Short answer: yes, it is technically possible for a private person to monitor another's device remotely without permission, but such acts are usually illegal and require technical skill or intrusive spyware. Methods include social engineering, malicious apps or links, exploiting unpatched vulnerabilities, or installing monitoring software in person. Commercial stalkerware is sold to private customers, though its use violates laws in many countries. Detecting unauthorized surveillance involves checking for unusual battery drain, unexpected apps or profiles, and network traffic to unfamiliar servers; running reputable anti-malware scans and consulting a professional helps. If you suspect monitoring, preserve evidence, disconnect compromised devices from networks, and report the situation to local law enforcement or a cybercrime authority. For better privacy, enable strong authentication, keep systems updated, avoid unknown links and installers, and use encrypted communications. I cannot help with instructions to spy on others; instead I recommend legal steps and seeking proper authorities.