What does it mean to add (live) to the title of the song?

Adding (live) after the title of the song indicates that the version of this song is the live version. Recorded in a concert or program.

The translation of live is: life, live broadcast.

So the live version is the live singing version. For example, concerts, demo Cantata, live performances, etc.

Generally, the sound quality of recording studio is not good, and there will be noise on the spot, which can not be repaired.

A concert is a live performance in front of an audience, usually a musical performance. Music can be performed by a single musician or by a group, and singers usually perform on the stage. What's more, there is considerable ticket income (of course, there are many large-scale performances that are free to enter). Concert is a carnival festival for fans.

Generally, large-scale open-air venues for concerts will be chosen, mostly provincial venues. Or a large stadium like a gymnasium.