2/4 has two beats in each bar, and each beat is a quarter note (that is what the lower number means). In practice it is felt as two even beats. You will hear it in marches, polkas, samba and many folk dances. Fast songs are also often counted in two.
The metronome above is set to 2/4: an accent on beat 1. The tempo counts quarter notes. Tap any beat to change its accent.