Also known as attendant bouquets, this can refer to any smaller bouquet given to friends or family to set them apart as the inner circle. They often have matching or mismatched dresses in the wedding colors and having bouquets for them to hold makes for great pictures! Bridesmaid bouquets are usually smaller versions of the bride's bouquet. Some people opt for them to be different colors than the bride or even ombre shades so they gradually become a different color down the line. Rather than bouquets, some people choose to do corsages or floral crowns for their bridesmaids instead.
If you are on a tight budget and have a lot of bridesmaids, you can ask your florist if they have a mini version or an all-greenery bouquet you can do instead. Or you can repurpose the bridesmaid bouquets as a toss bouquet and table centerpieces to save money in another spot. If you can afford it, I would recommend going all out for the bridesmaid bouquets as they make a big impact in pictures and can be a big thank you to the people who made you who you are and are probably right by your side to make sure the whole wedding runs smoothly.