A granny square is a crochet technique for producing square fabric by working in rounds from the center outward. Granny squares are traditionally handmade. They resemble coarse lace.
Although there is no theoretical limit to the maximum size of a granny square, crocheters usually create multiple small squares and assemble the pieces to make clothing, purses, Afghan blankets, and other household textiles. Granny square apparel is a cyclical fashion that peaked in the 1970s. As Stitch 'n Bitch series author Debbie Stoller describes: Although particular color and pattern schemes for granny squares change with time, this class of motif is a staple among crocheters.
Multicolor granny squares are an effective way to use up small amounts of yarn left over from other projects and basic granny square motifs do not require advanced skills to execute. According to Edie Eckman in The Crochet Answer Book, The familiar granny square is a special form of square motif. Although there are many variations on the granny square, the traditional one is a double-crocheted square made with a series of chains and double-crocheted blocks--a kind of filet crochet in the round.