na-adjective
Describes matters, affairs, or conditions within a single country, as opposed to international or foreign. Often used in news, politics, and economics.
この問題は国内的な問題だ。
This issue is a domestic matter.
国内的な需要が増えている。
Domestic demand is increasing.
国際的 means 'international', the opposite of 国内的.
Compound of 国内 (domestic, within the country) + 的 (suffix forming adjectival nouns).