This circuit is a two-stage Class A amplifier using two 2N2222 NPN transistors.
The first stage is a common-emitter amplifier that provides voltage gain. It uses a voltage divider for biasing and includes emitter degeneration for thermal stability.
The second stage is a common-collector (emitter follower) that buffers the output, offering low output impedance and suitable current drive for low-impedance loads. Capacitors are used for input and output coupling to block DC components.
