Bancha is the second flush of Sencha. It's a simple everyday tea and qualitatively a bit lower than Sencha. Bancha is usually harvested from the second flush of Sencha between summer and autumn. But, some higher quality bancha is even harvested in spring.
Bancha is steeped at approximately 70 - 80 degrees Celsius for up to 3 minutes. Infusing longer or at a higher temperature will cause the tea to taste bitter because it will extract more catechines.