Common loanword used in digital communication (email, social media, messaging) and general contexts for a reply or response.
メールのリプライがまだ来ていない。
I haven't received a reply to my email yet.
彼のツイートにリプライを送った。
I sent a reply to his tweet.
I replied to her post.
I got a lot of replies to my post.
I sent a reply to a tweet that caught my interest.