Question

What are determiners?
Thanks

Answer 1

determiners are the words that are placed in front of the noun to make it clear what the noun refers to. The common determiners are articles like 'the' 
(definite article), 'a, an' (indefinite articles). 

In addition to this 'this, that, these, those, etc' can also be used as determiners.

Answer 2

$\huge{HEY!!}$
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✔✔Determiners are those words which are used before a noun or pronoun to determine its meaning. Determines are of two types:-

⚫$\large{Specific \:Determiners}$

⏩⏩These are used to specify or identify people or thing.

☞Articles - a, an, the

☞Demonstrative adjectives - this, that, these, those

☞Possessive - my, yours, his, hers etc.

⚫$\large{General\: Determiners}$

⏩⏩These determiners are used when we talk about people in general without identifying them.

☞Adjectives of quantity - some, more, much etc.

☞Adjectives of numbers - first, second, fourth etc.

☞Interrogative adjectives - which, what, when etc.