If you are jumping the car most mornings, the battery is being emptied between when you park and when you return. There are only a few reasons that happens, and they are worth separating before you buy anything.
A parasitic drain
Modern vehicles never fully switch off. Alarms, keyless entry receivers, telematics modules, and infotainment all draw a small standing current, and that is normal and designed for. What is not normal is a module that fails to go to sleep, a boot or glovebox lamp staying on, or an aftermarket dashcam or alarm wired to a permanently live feed.
The tell for a drain is a car that is fine if you use it daily and dead if you leave it two days, with a battery that keeps testing healthy.
A battery that no longer holds charge
An old battery can accept a charge and then lose it overnight through internal self discharge. It will start the car right after a jump because the alternator is feeding it, and be flat by morning because it cannot store what it was given. This is the most common cause and the simplest fix.
A charging system that is not keeping up
If the alternator is under producing, the battery is never actually getting refilled. You are effectively running the car down a little further every day. Jumping it each morning masks this until the battery is damaged too, and then you have two problems.
Short drives
If your entire daily use is a ten minute trip, the alternator may genuinely not have time to replace what starting the engine took out. Over weeks this compounds into a battery that is permanently under charged, and cold weather finishes the job.
Corroded or loose terminals
Cheap to rule out and more common than people think. Resistance at the terminal means the alternator cannot properly charge the battery while you drive, and the starter cannot properly draw from it when you turn the key.
How to tell them apart
A load test says whether the battery still holds capacity. A charging test says whether the alternator is doing its job. A current draw measurement with the car asleep says whether something is stealing from it. Those three answers cover almost every case, and they take minutes.
What not to do
Do not keep jump starting it indefinitely. Repeatedly running a battery flat damages it, and if the underlying cause is a charging fault you are also stressing the alternator every time it tries to recover a deeply discharged battery.