Magnetic Testing is a non-destructive testing method used to detect surface and near-surface defects in ferromagnetic materials. This technique involves magnetizing the material and applying a fine magnetic powder or liquid. If there are any cracks or flaws, the magnetic field will leak out, causing the powder to cluster at the defect, making it visible for inspection. This method is commonly used in industries such as manufacturing, aerospace, and construction to ensure the integrity of components like welds and castings. It is efficient, quick, and can be performed on-site, making it a valuable tool for quality control and safety assessments.