Like all other targumim, TgLam renders the biblical book into Aramaic while incorporating rabbinic interpretations into the resultant text.
TgLam probably originated in the early centuries of the Common Era as a result of Lamentations' use in the liturgical worship of Tisha b’Av, the day commemorating the destruction of Jerusalem.
Reference to the use of a targum of Lamentations during Tisha b'Av services appears in the seventh-century text Soferim (42b).
The extant versions of TgLam incorporate rabbinic traditions and may date to as late as the eighth century CE.
The amount of additional material quickly declines so that the book's last three chapters are largely rendered verbatim.