Cell culture plates are widely used laboratory consumables for growing, maintaining, treating, and analyzing cells under controlled conditions. Their multi-well design allows researchers to perform multiple experimental conditions simultaneously while using relatively small volumes of culture medium and reagents. Proper use of a cell culture plate requires more than simply adding cells and culture medium. Cell type, seeding density, surface treatment, medium composition, incubation conditions, and aseptic technique can all affect cell attachment, growth, morphology, and experimental reproducibility. This guide explains what cell culture plates are, how to select the appropriate format, how to use them correctly, and how to avoid common problems during cell culture.