Real-Time and In-Field Analytical Methods are transforming how data is collected and interpreted across various scientific and industrial applications. These techniques enable immediate analysis of samples directly at the site of interest, eliminating the need for transporting them to a laboratory. Common tools include portable spectrometers, handheld X-ray fluorescence (XRF) devices, and mobile chromatography systems. Real-time analysis is crucial for rapid decision-making in fields like environmental monitoring, agriculture, food safety, clinical diagnostics, and industrial process control. In-field methods enhance efficiency, reduce analysis time, and lower operational costs. Their portability, ease of use, and ability to deliver quick, accurate results make them invaluable for time-sensitive and remote applications. Continuous advancements are further improving their sensitivity, connectivity, and integration with digital platforms.