Seed beads are smaller beads, frequently used as accents when making beaded jewelry pieces by stringing beads. Seed beads are often made of colored glass and are relatively inexpensive. These beads range in size from 1mm thick to less than 3mm in thickness. Seed beads are often used in modern bead stringing projects to provide the same spacing between larger beads that were formerly separated by knots in silk thread. With newer bead stringing wire, knotting between each bead isn't required and to achieve the same appearance the seed beads are strung between the larger beads to provide the spacing.
View seed beads used in making jewelry here.