Semantics basically means "The study of meaning". Usually when people are talking about code being semantically correct, they're referring to the code that accurately describes something.

What is a semantically correct sentence?

in order for the sentence to also be semantically correct, it needs to be a verb that describes movement from one place to another. so if you say "I go to the store," that's both syntactically and semantically correct.

Is syntactically and semantically correct?

Syntax and semantics. Syntax is the grammatical structure of the text, whereas semantics is the meaning being conveyed. A sentence that is syntactically correct, however, is not always semantically correct.