noun
Refers to a person with deep, often obsessive knowledge or enthusiasm for a particular subject, especially technology, computers, or niche pop culture. Similar to 'otaku' but with a slightly more positive or neutral connotation in modern Japanese.
彼はコンピューターのギークで、自作PCに詳しい。
He's a computer geek and knows a lot about building his own PCs.
あのギークはアニメの知識がすごい。
That geek has an amazing knowledge of anime.