Here's why:
Your car's electrical system relies on the battery to provide power to all of its components, including the starter motor. When the battery is weak, it may not be able to provide enough power to the starter motor to crank the engine.
In addition, a weak battery can cause other problems that could prevent your car from starting, such as:
Dim headlights or interior lights
Slow or sluggish engine cranking
Difficulty shifting gears (in automatic transmission vehicles)
Stalling or hesitation while driving
If you're experiencing any of these problems, it's possible that your battery is weak and needs to be replaced. You should have your battery tested by a qualified mechanic to determine if it's still good or needs to be replaced.