When a map is to 'scale' it means there is a specific key and all distances on the map have been measured precisely to the scale listed in the key. In other words, you can rely upon the information as being accurate. When a map is "not to scale" this measure of accuracy has not been checked. Some distances may be accurate, or really close, but you should not rely upon the information as fact.
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It is drawn to full size
This is known as the scale.
The scale of a map may indicate the ratio as well as showing how lengths measured on the map represent actual distances.
The scale on a printed map is the ratio of a distance on the map to the distance on the ground. For example, 1 inch on a 1:250000 scale map would be 250000 inches on the earth.
The "scale" of a map tells you how the map displays the actual distance.