Chevrolet Blazer (and GMC Jimmy) can refer to one of several Truck models from General Motors:
The full-size Chevrolet K5 Blazer, based on the C/K pickup chassis and built from 1969 to 1999 (renamed to Tahoe in 1995 for the 2-door model)
The compact and mid-size Chevrolet S-10 Blazer, based on the S-10 pickup and built from 1983 to 2005
The Chevrolet TrailBlazer, originally a trim package on the S-10 Blazer until 2002, when it became its own, larger model
The Chevrolet Tahoe, sold in Argentina, Brazil, Ecuador and Venezuela under the Grand Blazer name from 1990 to 2000