For moms who have/had colicky babies?

I just had my baby 3 weeks ago and I wanted to know what exactly is Colic? I looked it up on google and it seems just be having episodes or crying uncontrollably, not hungry, or anything but it said they can be gassy and holding helps. Is this true for you moms who have/had colic babies? I ebf my son, and he sleeps amazing through the night, He normally wakes up about 3 times and we go in the living room around 6am. But then through the day he screams and screams unless I hold him. I cannot hold him all the time, I have a toddler who gets into everything. Do you think this is colic? I don’t know what to do