Yes, very much so. Is is the present tense form of the verb to be in Afrikaans.
So in this sentence:
Afrikaans uses is for all persons in the present tense:
That is simpler than English, because Afrikaans does not change the form the way English does with am / is / are.
In this sentence, duidelik comes after the verb is, so it is a predicate adjective. Predicate adjectives in Afrikaans usually do not take extra endings.
Compare:
Notice the difference:
That is a very useful pattern in Afrikaans.
Die is the normal definite article in Afrikaans, used for the.
One important point for English speakers: Afrikaans does not mark grammatical gender the way Dutch or German does in the article. So you do not have to learn different forms like the for masculine, feminine, and neuter nouns in ordinary Afrikaans usage.
That makes sentences like this simpler:
All can use die for the.