Print[, , ... ] prints the , followed by a newline (line feed).
Print sends its output to the channel $Output.
Print uses the format type of $Output as its default format type.
Print concatenates the output from each together, effectively using SequenceForm.
You can arrange to have expressions on several lines by using ColumnForm.
See The Mathematica Book: Section 1.7.3 and Section 2.8.18.
See also: CellPrint, Message, Put, Write.