This is a picture I took.
With my camera, from the stone ages, like all of my tech. :-)
Don't seem so impressive except that someone else in the world viewing this picture could tell me exactly the same thing. Every picture taken has some information attached to it. This info is embedded on the image by the camera or smart phone. It's referred to as Metadata.
There is any number of programs that can help you see what data is embedded on your pictures but you could view this information in Windows. Just right click on a picture, go into it's Properties, and click on the Details tab.
While you have the properties window open, you can easily use it to remove this data. Click on the blue letters towards the bottom that say Remove Properties and Personal Information.
Clicking on that opens another window.
You can click on Create a copy with all possible properties removed. Or if you want to pick and chose what to remove click on Remove the following properties from this file: - this just go down through the list and check whatever info you want removed.
If you go back to the details tab, you can actually add information if you want. For example in the Description section, just by hovering my mouse under the column Value across from the word Title a line appears with the wording Add a title. I can click on that and type in a title. And do the same for the rest. So, in this case you'll be adding metadata. Your choice.
If you want to remove the data from a lot of pictures at once you might need a third party program. I can do it with my picture viewer program called Xnview - http://www.xnview.com/en/
For individual photos I just open them up in Xnview, click on Edit then Metadata, then Remove All Metadata. Save picture after - same or different name your choice.
For Multiple pictures at once I have to switch to the browser view.
Then I can select multiple pictures at once and then select Edit > Metadata > Clean.
Then you can select all options in the Clean Metadata box and select OK. Saving is done automatically.
So that's it. A little bit of privacy control for the little bit of paranoia in all of us.