What are the types of bactreia?

Bacteria can be classified into several types based on shape, metabolism, and other characteristics. Common shapes include cocci (spherical), bacilli (rod-shaped), and spirilla (spiral). They can also be categorized based on their oxygen requirements, with aerobic bacteria needing oxygen to survive and anaerobic bacteria thriving in its absence. Additionally, bacteria can be classified as Gram-positive or Gram-negative based on their cell wall structure, which influences their response to antibiotics.