What does developing photography mean?

The meaning of this sentence is as follows:

According to the information of Kuaishu Encyclopedia, printing photography is an anti-counterfeiting printing technology developed by using laser holographic imaging technology. The three-dimensional model is irradiated with a laser beam and reference light from the laser beam from different angles.

The light reflected by the model passes through the slit to form interference fringes containing holographic information of the model. This interference fringe is recorded on the photosensitive film, turned into a nickel plate, and then pressed on the aluminum-plated film to copy the holographic pattern of the model under ordinary illumination. This is the principle of developing photography.