In terms of its inflections is a regular verb, with the third person form wants (/wɒnts/), the preterite and past participle "wanted" /wɒntɪd/ and the -ing form "wanting" /wɒntɪŋ(g)/. And of course it takes the third person -s. Its pronunciation however is somewhat irregular, as we say /wɒnt/ rather than */wænt/
Its catenates with a to-infinitive (e.g. "I want to do something"), or, being an ambitransitive verb, it can take a direct object (e.g. "I want something"). If followed by a gerund, it can mean a thing that needs to be done to it, e.g. "this horse wants shooting".
Want is the most common English regular verb - all commoner verbs being irregular.
Historically, "want" meant "lack", and acquired its present meaning only relatively recently. This usage may be found in some fixed phrases, e.g. "for the want of..."
Note that saying "I want something" is a bit rude, and it's often better to use would like instead.
Note that "want to" and "want a" are both often written as "wanna", imitating speech.