See (/si:/) is an English verb.
It's a sense-related verb, related to sight. Compare look and watch.
See is an irregular verb. It has the 3rd person form "sees" (/si:z/), with the -ing form "seeing" (/si:jɪŋ(g)/). It has the irregular preterite "saw" (/sɔ:/) and the irregular past participle "seen".