lets / let’s [lɛts]
lets – n. pl. & v. 3rd pers. sing. present of let – n. – hindrances, obstructions, impediments; v. – 1. allows to remain or occupy; 2. leaves undone, omits, ceases to speak of; 3. quits, abandons, forsakes; 4. grants temporary possession; 5. sets free, liberates; 6. permits, allows; 7. hinders, obstructs, prevents; 8. delays, tarries
let’s – contraction – let us – followed by a verb, and adds emphasis