"Gram-Positive" refers to a classification of bacteria that retain a purple color when subjected to a laboratory staining technique called the Gram stain. This occurs because their thick cell wall, primarily made of peptidoglycan, traps the dye. Gram-positive bacteria are often associated with various infections and diseases, making them important in medical microbiology. These bacteria can be found in many environments, including soil and the human body. Some well-known Gram-Positive bacteria include Staphylococcus aureus, which can cause skin infections, and Streptococcus pneumoniae, responsible for pneumonia. Understanding Gram-positive bacteria helps in developing effective treatments and antibiotics.