A guideline is a suggested rule or recommendation that helps people make good decisions or take appropriate actions. Guidelines aren't strict laws you must follow, but rather helpful directions that point you toward the best way to do something.

Think of guidelines like the lane markers painted on a road. You're supposed to stay between them, but you can cross them when you need to pass another car or avoid an obstacle. School guidelines might suggest how long a book report should be or recommend studying for 30 minutes each night. Medical guidelines help doctors decide which treatments usually work best for certain illnesses.

The key difference between a guideline and a rule is flexibility. If your teacher gives you guidelines for a project saying it should be “about three pages,” you probably won't get in trouble for writing two and a half or three and a half pages. But if there's a rule that essays must be exactly three pages, that's different.

Guidelines work well when situations vary too much for one-size-fits-all rules. They give people useful direction while trusting them to use good judgment. A recipe might offer guidelines for baking time (“about 25 minutes, or until golden brown”) because every oven is slightly different. Following reasonable guidelines usually leads to good results, even if you don't follow them exactly.