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Shadows are formed because light travels in straight lines. I should point out that this is a simplified view as demonstrated by diffraction where light does bend around sharp corners. Also, in order for light to travel in a straight line, it has to travel in vacuum or a homogeneous/even medium. The light will bend, as it does when the medium changes and light enters at the non-right angle. Or when the medium is uneven, like air close to ground on a hot day. Then there is gravity. According to General Theory of Relatively, mass warps space-time and thus light will travel in a "curved" line. From the question, I am guessing that the person who asked the question is young and/or has not read a lot about physics yet. Shadows are formed when light encounters an object which it cannot pass through and thus get blocked. Because the light became blocked, the area behind it will be in darkness, which we call a shadow. Another person has already pointed out that for shadows to form, two things are needed viz. A light source and an object to block the light. I want to add that we need a third viz. A screen, for most of what we usually call a shadow; although this is not required as far as physics/optics is concerned. Only when we see the absence of light falling on the screen do we call it a shadow.