Abbreviation of プロフィール, used in casual contexts for a person's profile or summary.
See also: プロフィール
彼のプロフを見たら、趣味がたくさん書いてあった。
When I looked at his profile, it listed many hobbies.
profile page
Specifically an online profile page, such as on social media or a website.
Twitterのプロフに自己紹介を載せている。
I put a self-introduction on my Twitter profile page.
I checked out the profile of someone I was curious about.
写真を変えてプロフを更新した。
I changed my photo and updated my profile.
I wrote about the music I like in my profile.