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A basic stain stains the bacteria (the stain is a positively charged molecule that attaches to cells which are negatively charged or to negatively charged molecules in cells.) A negative stain does not stain cells (why its called a negative stain), it stains the background around the cells.
Gram stain is a very important differential staining techniques used in the initial characterization and classification of bacteria in Microbiology. Gram staining helps to identify bacterial pathogens in specimens and cultures by their Gram reaction (Gram positive and Gram Negative) and morphology (Cocci/Rod).