212 Light Royal Blue / Bright Light Blue
BrickLink: Bright Light Blue
Introduced in 2004 in Duplo/Belville, this color replaced 45 Light Blue as part of the big color change around that time.
The color has seen much more use in recent years; the color was used in about 13 sets prior to 2010, but in over 50 since then, thanks mostly to Friends and Legends of Chima.
Just to be clear, this is NOT Medium Blue! This color is considerably rarer. If you have something from Pick-a-Brick, it's definitely not Bright Light Blue.