This and these are used in different ways when you are referring to people, things, situations, events, or periods of time. This, that, these and those are demonstratives. We use this, that, these and those to point to people and things.
These and those are plural. To better mirror human developmental learning, we need to account for these external. This and these are demonstratives, which means they indicate a specific noun in a sentence.
The two words are similar because they refer to nouns that are near in space and time. You use these to refer to people or things that are near you, especially when you touch them or point to them. I put these pictures up here to show how children are solving the problem.
Definition of these in oxford advanced american dictionary.