Can anyone explain to me?

One of you just clarifies to me !?
How is an image disguised so that it looks natural, and after using paid programs, checking them and changing colors, we find that they hide many things, But why would someone do this in every picture and not just install it on Photoshop, for example?
The most dangerous and difficult and which framed my mind and searching through the Internet for a while did not work as a result .
How can someone in a direct call via WhatsApp hide things? And so that there is more than one cadre in the same picture One of them is basic and the others are smaller in size Also, what is the purpose of this, what is the name of this matter, and what tools do they use? Please clarify in this regard,

if there is one of the experts who is capable of that and wants a return for this work, I am ready
Thank you

Sure! I can help you. What you are referring to is steganography. I do not do this professionally myself, but we photo editors know how to hide just about anything. Do you want to provide the screenshot here in the comments or via DMs? I'll do it for free if you can explain what you want done, too.

What you’re describing is classic digital steganography—sneaking hidden images or data into a photo in a way that’s invisible to the naked eye. Rather than slapping layers on in Photoshop, these tools tweak the image’s least-significant bits or its JPEG compression coefficients so that a secondary “mini-picture” lives inside the main one. Apps like Steghide, OpenStego or OpenPuff automate the process: you feed in your cover image plus the secret payload, and they output a single file that looks normal but carries your hidden frames.
On WhatsApp calls or chats you’d simply send that stego-image as you would any other photo—WhatsApp’s automatic recompression usually won’t break well-done LSB steganography. People use it to watermark photos, embed tracking IDs, or covertly transmit extra images without obvious layers. If you’re experimenting, try extracting with the same tool and key you used to embed; that’s the whole point—it takes the right password/toolchain to reveal the hidden content.