Can the camera's own flash adjust its brightness?

The flash of the card machine supports automatic flash control (flash output is set according to the main body distance and ISO). The set-top box flash of SLR camera also supports TTL automatic flash, which has stronger exposure control function. You can also choose "slow synchronous flash" to make the night scene background exposure normal, and the main characters illuminated by the flash are also exposed normally. This flash mode is also called "night portrait flash mode".