Check this link the artciles maybe help you

http://engineeringhut.blogspot.mx/2010/11/lathe-fixtures-or-turning-fixtures.html

http://www.mechanicalbooster.com/2016/11/difference-between-jigs-and-fixtures.html

Hi Md. Zahid, the question is a little unclear. In the case of the mill, the tool is the rotating part, so it is usually a circularly symmetric cutter. The work piece is then solidly clamped in a vice or using clamps to the work table. In the lathe the process is reversed with the cutter held stationary and the work piece rotated in a chuck or fixed to a face plate. If the work piece is not circularly symmetric, care has to be taken to balance it to minimize the vibrations when it rotates. In both cases, as many cutters can be used for one job, they often have some form of quick release mechanism for fast change over, and to ensure they are positioned accurately.

Sir, in lathe the workpiece holding area (Spindle) side itself acts as a fixture. Where are in milling need to create a T slots and then hold the workpiece

As Phil and Venkata say, the difference is the type of machine the fixture is on. A fixture is normally used to hold the work piece whilst it is machined. Its shape & operation is therefore dependant upon the work piece shape and the way the cutting tool removes material.

thanks for the recommendation