primary metabolites are products utilize mainly by plants or animal. while secondary metabolites are the end products of primary one. you can see the following link, that may help you:

https://biodifferences.com/difference-between-primary-metabolites-and-secondary-metabolites.html

Excellent idea to compare bio-differences....

Secondary metabolites are the end products of the proces,

and for organisme - the products of rejection (for exemple, aromatic essential oil).

In the some time,

these products are involved in attracting insect pollinators,

or It is these products that can possess toxic substances and protect the body from being eaten, etc.

Best regards

@Zahraa Nassir, Thanks so much.