This is the 76th most frequent Russian word.
там
There.
Here, 'там' points to a location being described as beautiful.
Там красиво особенно летом.
It's beautiful there, especially in summer.
In this sentence, 'там' refers to a specific place implicitly or explicitly defined.
Если будешь там, позвони мне.
If you are there, call me.
'Там' indicates a specific point or place being referenced within the context of the statement.