Pig behaviour is the key indicator of health, welfare and productivity but continuous manual observation is often difficult especially in large or intensive farming systems. Recent advances in technologies have introduced smart monitoring system that act as ?smart eyes? in the pigsty, enabling continuous monitoring of pigs. This system uses cameras, environmental sensors and artificial intelligence techniques to monitor key behaviours such as movement, posture, feeding, aggression, heat stress and farrowing-related activities. By analysing behaviour patterns in real time, smart technologies can provide early warnings of disease, stress, management issues allowing timely interventions by farmers. The adoption of smart monitoring system offers several advantages such as enhanced animal welfare, reduced labour dependency, better feed efficiency and increased productivity.