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While what iKlsR says is indeed the most efficient, it's often preferred to either add edge loops on both sides of the hard edge, or bevel it (Ctrl + B). When smooth shaded this produces a more realistic surface since there's seldom any truly sharp corners in reality, and also catches specular highlights nicely showing off the model better.

Note that the Edge Split modifier shouldn't be used when beveling or using edgeloops to sharpen corners. Edge Split physically cuts the model to fake a sharp corner, whereas beveling actually creates the corner.

While what iKlsR says is indeed the most efficient, it's often preferred to either add edge loops on both sides of the hard edge, or bevel it (Ctrl + B). When smooth shaded this produces a more realistic surface since there's seldom any truly sharp corners in reality, and also catches specular highlights nicely showing off the model better.

Note that the Edge Split modifier shouldn't be used when beveling or using edgeloops to sharpen corners. Edge Split physically cuts the model to fake a sharp corner, whereas beveling actually creates the corner.

While what iKlsR says is indeed the most efficient, it's often preferred to either add edge loops on both sides of the hard edge, or bevel it (Ctrl + B). When smooth shaded this produces a more realistic surface since there's seldom any truly sharp corners in reality, and also catches specular highlights nicely showing off the model better.

While what iKlsR says is indeed the most efficient, it's often preferred to either add edge loops on both sides of the hard edge, or bevel it (Ctrl + B). When smooth shaded this produces a more realistic surface since there's seldom any truly sharp corners in reality, and also catches specular highlights nicely showing off the model better.

Note that the Edge Split modifier shouldn't be used when beveling or using edgeloops to sharpen corners. Edge Split physically cuts the model to fake a sharp corner, whereas beveling actually creates the corner.

While what iKlsR says is indeed the most efficient, it's often preferred to either add edge loops on both sides of the hard edge, or bevel it (Ctrl+B). When smooth shaded this produces a more realistic surface since there's seldom any truly sharp corners in reality, and also catches specular highlights nicely showing off the model better.  

While what iKlsR says is indeed the most efficient, it's often preferred to either add edge loops on both sides of the hard edge, or bevel it (Ctrl + B). When smooth shaded this produces a more realistic surface since there's seldom any truly sharp corners in reality, and also catches specular highlights nicely showing off the model better.