Hello !
What type of word is "un" ?
→ a masculine indefinite article
we us "un" when we're talking about an indeterminate masculine thing or person like :
<em>un chat, un chien, un garçon... </em>
a masculine definite article : le
a feminine definite article : la
a feminine indefinite article : une
a masculine indefinite article : un
<em>× × i hope i helped you ! × ×</em>