I just like talking to people. I like being able to go down the hall and solving a problem in 5 minutes that would take 3 days and 3 meetings WFH. I am "friendly" with many people in the office. I socialize with them.
They aren't dear dear friends but they are acquaintances that have helped me out of tight spots and I helped them. I can't tell you how many times I've been helped through these sort of relationships.
If you're introverted just say it. There's nothing wrong with it. But there's nothing wrong with socializing either.