Yes, this bulb will fit into E26/E27 sockets—typically referred to as a “medium” or “standard” base. This is the most common size in which you’ll find lamps and fixtures.

A PAR38 bulb is 4.75″ wide, so ensure that hooded fixtures—as are typical in track lighting cans—have sufficiently large openings to fit the bulb. It’s best to check the fixture specifications to see if it is recommended for a PAR38 bulb.