Unfortunately, if you decide to enjoy it one year, you will find thousands of the things next year, the next, the next - well, you get the idea. It's usually easy to pull up, though tender white square stems do break easily. Tender white roots run and run and run, interspersed with small white tubers. You really wouldn't believe how this stuff takes over if you aren't Johnny on the spot. Leave a bit, and you'll have 1,000 more.
White clover is a low-growing perennial.
Compound leaves sport three leaflets marked with white, and they aren't lucky. It does produce nice little globe-shaped white flowers in spring, but those clumps just get bigger and bigger, thanks to creeping stems that happily root at nodes. If you get it, your turf grass may scream because the clover may win. Clumps pull fairly easy in moist or loose soil, but some people resort to herbicides. Fond of cool weather, it reproduces with underground bulbs, aerial bulbils and seed.