What are words?

A simple chorus from the song that touched me deeply:
What are words
"If you really don't mean them
When you say them
What are words
If they're only for good times
Then they don't
When it's love
Yeah, you say them out loud
Those words, They never go away
They live on, even when we're gone"

remember the promises we made to each other,
the sacrifices we made
cause in the end,
it will be all worth it when we win:)