所有 (suǒyǒu) as an adjective means 'all, every' — it comes before a noun (often with 的) to mean 'all of the ...'. As a verb, it means 'to possess, to own' in formal writing, stronger and more legal/formal than 有 (yǒu) 'to have' and less abstract than 拥有 (yōngyǒu) 'to possess (important things)'.