
A locus is a set of points that satisfy a condition.^{[1]} The points may be continuous. For example, a line is the locus of all points equidistant from two points. Click on the blue points in manipulative 1 and drag them to change the figure. Points A and B are the points on which the line is defined. Dragging point C draws the line composed of points equidistant from points A and B. Manipulative 2 is the locus of all points equidistant from a center. Click on the blue point in manipulative 2 and drag it to see the locus. 

Click on the blue points and drag them to change the figure. Click on the red point and drag it to trace the parabola. Click on the reset button to clear previous traces. How can you arrange the line and point so that the parabola degenerates into a line? 
Manipulative 3  Parabola as a Locus of Points Created with GeoGebra. 
Manipulative 3 lets you construct the locus of points equidistant from a point and a line.

A compound locus is a locus with more than one condition. The points included in the locus must meet all of the conditions. Manipulative 5 illustrates a locus of all points equidistant from A and B that lie within the disk centered at A with a radius AB. 
#  A  B  C  D 
E  F  G  H  I 
J  K  L  M  N 
O  P  Q  R  S 
T  U  V  W  X 
Y  Z 
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