Chromatic aberration is an imaging error from optical lenses, which is caused by strong refractions of light.
The flaw is seen in the form of green and red or blue and yellow colour fringes at the edges of the subject in an image.
Example:
Processing:
In Photoshop or in Lightroom there is the function "Lens correction"
To do this, open the image in, for example, Photoshop and go to "Filter" > "Lens Correction"
Then a separate window opens, in which you select "Custom".
Here you have various customization options. Depending on the image defect, you should test the settings that make your image look the best.
Finished result: