Agarose precast gels are widely used in molecular biology laboratories for the separation and analysis of DNA and RNA fragments by gel electrophoresis. These ready-to-use gels eliminate the need for in-house gel preparation, saving time and ensuring consistent quality and reproducibility across experiments. They are commonly used in applications such as PCR product analysis, restriction enzyme digestion verification, genotyping, and size determination of nucleic acids. Precast agarose gels are compatible with standard electrophoresis systems and staining techniques, including ethidium bromide, SYBR Safe, and other fluorescent dyes. They are available in various concentrations and formats, including wells with different configurations, to suit a range of sample sizes and resolution needs. Their uniform pore size provides sharp, well-defined bands, improving accuracy in fragment sizing. These gels are especially beneficial in high-throughput settings, diagnostic labs, and educational environments where speed, reliability, and ease of use are essential. Some precast gels also come with loading dyes and ladders integrated, further simplifying the workflow and reducing the risk of pipetting errors.