Network latency affects user experience by determining the delay before a data packet is transferred from source to destination. High latency can lead to slow loading times, buffering issues, and interruptions during real-time interactions, resulting in frustration for users. In applications like gaming or video streaming, low network latency is critical to maintaining an enjoyable experience. Businesses must optimize their network infrastructure to minimize latency, ensuring that users have a seamless and responsive experience when engaging with online platforms.