Being extremely popular or well-liked by many people; very high popularity (used in phrases like 'very popular' or 'a big hit').
その新作アニメは若者の間で大人気だ。
That new anime is very popular among young people.
このカフェはおしゃれで大人気のため、週末は満席になる。
This café is stylish and so popular that it fills up on weekends.
あのアイドルグループは海外でも大人気を博している。
That idol group is hugely popular overseas as well.
新商品は発売直後から大人気で、店頭からすぐに売り切れた。
The new product was highly popular right after release and sold out quickly in stores.