Which flip flops are used in counter?

In counters, the most commonly used flip-flops are the D flip-flop and the T (toggle) flip-flop. The D flip-flop is often used in synchronous counters where data is sampled on a clock edge, while the T flip-flop is particularly suited for binary counters because it toggles its output state with each clock pulse. Both types enable the construction of various counting sequences in digital circuits.