Bass/beɪs/ Definition 1 of 4Pro Tip 1/3Types of Bass Know that 'bass' can refer to many fish species, not just one. Different types of bass thrive in various environments. Pro Tip 2/3Cultural Activity Bass fishing is popular in the US, where it's both sport and hobby. Bass fishing competitions are common in the summer. Pro Tip 3/3Freshwater Fish When saying 'bass' alone, people usually mean the freshwater varieties. Lake waters often house several species of bass.