DNA purification is a crucial step in many molecular biology applications, such as cloning, sequencing, and gene expression analysis. The Wizard Plus SV Minipreps DNA Purification System from Promega is a widely used method for isolating high-quality plasmid DNA from bacterial cultures. This protocol utilizes a silica membrane-based spin column to bind and purify plasmid DNA from a clarified bacterial lysate. The process involves cell resuspension, lysis, neutralization, and binding of DNA to the column, followed by washing steps to remove impurities. Finally, the plasmid DNA is eluted in a small volume of nuclease-free water, ready for downstream applications. This method is efficient, reproducible, and suitable for processing small to medium-scale bacterial cultures.