A portable saw comprising: a head portion including at least a first groove and a second groove, the second groove disposed spaced apart with respect to the first groove; a blade coupled to the head portion, the blade extending away from the head portion; a handle portion to be used to hold the portable saw during sawing operation and rotatably coupled to the head portion, the handle portion extending away from the head portion, the handle portion disposed opposite with respect to the blade; and a locking mechanism adapted to lock the head portion with respect to the handle portion in at least a first position and a second position, wherein the locking mechanism is adapted to selectively slidably engage at least one of the first groove and the second groove provided in the head portion to lock the head portion with respect to the handle portion in the first position and the second position respectively, and wherein the locking mechanism includes a spring element that is in contact with a slider element to bias the same in an engaged position, where the locking mechanism selectively slidably engage at least one of the first groove and the second groove provided in the head portion, wherein the locking mechanism is provided in association with each of the handle portion and the head portion, and where the locking mechanism includes: the slider element adapted to selectively slidably move between an engaged position and a disengaged position; a coupling mechanism disposed between the head portion and the handle portion, wherein the coupling mechanism is adapted to rotatably couple the head portion with respect to the handle portion; wherein the coupling mechanism includes: an extension portion provided in the head portion; and a receiving portion provided in the handle portion, the receiving portion adapted to rotatably receive the extension portion; wherein the locking mechanism is disposed, at least partially, in the handle portion, so that the slider element is adapted to slidably move between an engaged position and a disengaged position by a finger of a user holding the handle portion; characterized in that: the coupling mechanism further includes a central pin disposed in association with each of the head portion and the handle portion, and wherein the central pin is adapted to rotatably couple the head portion with respect to the handle portion, wherein the central pin is axially aligned with respect to a longitudinal axis (X-X') of the head portion. a head portion including at least a first groove and a second groove, the second groove disposed spaced apart with respect to the first groove; a blade coupled to the head portion, the blade extending away from the head portion; a handle portion to be used to hold the portable saw during sawing operation and rotatably coupled to the head portion, the handle portion extending away from the head portion, the handle portion disposed opposite with respect to the blade; and a locking mechanism adapted to lock the head portion with respect to the handle portion in at least a first position and a second position, wherein the locking mechanism is adapted to selectively slidably engage at least one of the first groove and the second groove provided in the head portion to lock the head portion with respect to the handle portion in the first position and the second position respectively, and wherein the locking mechanism includes a spring element that is in contact with a slider element to bias the same in an engaged position, where the locking mechanism selectively slidably engage at least one of the first groove and the second groove provided in the head portion, wherein the locking mechanism is provided in association with each of the handle portion and the head portion, and where the locking mechanism includes: the slider element adapted to selectively slidably move between an engaged position and a disengaged position; a coupling mechanism disposed between the head portion and the handle portion, the slider element adapted to selectively slidably move between an engaged position and a disengaged position; a coupling mechanism disposed between the head portion and the handle portion, wherein the coupling mechanism is adapted to rotatably couple the head portion with respect to the handle portion; wherein the coupling mechanism includes: an extension portion provided in the head portion; and a receiving portion provided in the handle portion, the receiving portion adapted to rotatably receive the extension portion; wherein the locking mechanism is disposed, at least partially, in the handle portion, so that the slider element is adapted to slidably move between an engaged position and a disengaged position by a finger of a user holding the handle portion; an extension portion provided in the head portion; and a receiving portion provided in the handle portion, the receiving portion adapted to rotatably receive the extension portion; wherein the locking mechanism is disposed, at least partially, in the handle portion, so that the slider element is adapted to slidably move between an engaged position and a disengaged position by a finger of a user holding the handle portion; characterized in that: the coupling mechanism further includes a central pin disposed in association with each of the head portion and the handle portion, and wherein the central pin is adapted to rotatably couple the head portion with respect to the handle portion, wherein the central pin is axially aligned with respect to a longitudinal axis (X-X') of the head portion.