Okay buddy, so "Caritas in Veritate" is a Latin phrase that means "Charity in Truth". It's actually the name of a very important letter that was written by Pope Benedict XVI way back in 2009.
Now, when we say "Charity in Truth", we mean that we should always be kind and loving to other people, but we should also try to be honest and fair in everything we do.
The letter talks about how we should use our resources and help each other out, especially those who are less fortunate. It also talks about how we should work together as a global community to make the world a better place, like reducing poverty and protecting the environment.
So basically, Caritas in Veritate is a reminder that we should be nice to others and do the right thing, just like your parents or teacher tells you. It's important to remember that even as we grow up, we should always be kind and truthful in everything we do.