The differences between adobe photo shop and lightroom:
That when you enter lightroom, the editing is right in front of you, while if you enter photoshop, you will have to open it up through files and edits, which can be confusing to some and take longer. Another difference would be that photoshop has way too many extra buttons which can be a good thing because they have a wide variety of editing options. Lastly, lightroom its harder to learn how to save photos into your files and open them into lightroom.
Some of the similarities
between the two would be that they both have basic editing controls
They both are easy to use once you understand how to use them.
They both also have extra editing features that we can use if we learn how to use it.