There are five categories of determiners:

• Articles: a, the 
  
• Demonstratives: this, that, etc.
  
• Possessive adjectives/possessive determiners: my, our
  
• Interrogative adjectives/interrogative determiners: whose, which
  
• Quantifiers: some, a few,  several
  

Numbers: Cardinal (one, two, three) and ordinal (first, second, third) numbers are also used as determiners.