The Balmer series consists of spectral lines that occur when an electron transitions from higher energy levels ($n>2$) to the second energy level ($n=2$). Other series include:

• Lyman series: Transitions to $n=1$ (Ultraviolet)
• Balmer series: Transitions to $n=2$ (Visible)
• Paschen series: Transitions to $n=3$ (Infrared)
• Brackett series: Transitions to $n=4$ (Infrared)
• Pfund series: Transitions to $n=5$ (Infrared)