Love is complicated to explain since it's different for every person but I'll try. Love is someting you can feel for a person or thing. Like you feel affection for it most times. Families usually love one another even if they don't always get along. People can love their country even though it's an inanimate object and can't love back. And for some, love will let a person be willing to sacrifice themselves for the person/thing they care deeply about. Like a parent dying to protect a child.
A good example I have of that is my friend Torunn was willing to sacrifice her life to ensure a threat to her closest friends and Earth was dealt with. Another is the older you from my version of Earth laid her life down to try and stop that same threat so that me and everyone else on Earth could live.
I mean you can look up the word love if you want but for me, that's what love is. So even if you don't remember me or care about me, I'll still love you Mom.