A tie is a curved line that connects two notes with the same position on the staff. A tie tells you to play the first note only, and to hold it for the length of both notes.
Play the C note and chord and hold them for six beats.
This Caribbean folk song contains several ties which go across the bar line. Using ties is the only way of indicating that a note should be held across a bar line. Take care with the timing of the left hand part in this song.