In the development of functional foods and pharmaceuticals, probiotic bacteria are used. They serve a vital function in human health promotion and maintenance. Probiotic strains must be present in a viable state at a reasonable level throughout the product's shelf life till ingestion in order to offer health benefits and retain high viability throughout the gastrointestinal tract. pH, post-acidification during product fermentation, hydrogen peroxide generation, and storage temperatures all have an impact on probiotic viability in products. Providing probiotic live cells with a physical barrier to protect them from harmful conditions is a method that is now gaining a lot of attention. PET (Probiotic encapsulation technology) is an intriguing branch of biopharmacy that has exploded in popularity over the last ten years. A variety of microorganisms have been immobilised within semipermeable and biocompatible surfaces that control cell distribution using this approach.