Love is one of the most universal human experiences of all—yet it's still not easy to define. Often, you just know it when you feel it. A simple glance at the person may cause strong feelings of affection and attachment. You may also feel an overwhelming need to make that person happy—because love is also an action, not just a feeling. Truly loving someone means caring for them in the ways that they need to be cared for, with no strings attached. (That's why they call it unconditional love.) There's not a one-size-fits-all instruction kit for how to love someone.