The construction and wearing of various types of shoes and sandals goes back thousands of years. Our modern shoe owes a great deal to technological advances in construction and manufacturing made in the 19th century: these include foot forms called 'lasts' used to make right and left shoes (shoes were essentially identical - and not very comfortable - for each foot prior to the differentiated last); special sewing machines for attaching the sole to the upper; and the rubber sole, so popular in today's athletic shoes.
Today, shoes that once took days for an artisan to make can be produced in an hour thanks to these and other technological advances. How the modern shoe is constructed depends to a certain degree on the type of shoe being built. Whereas, once there were just a few types of shoes available, such as sandals, work boots and court shoes, today there are shoes designed for hundreds of different purposes in a nearly infinite array of styles. The construction process for an athletic shoe that may involve lots of high-tech materials differs greatly from that of a woman's high heel which has its roots in the court shoes of Europe. Similarly dance slippers, work boots and men's shoes all have construction variations unique to them.
But, at the end of the day, a shoe is a shoe is a shoe and some aspects of their construction remain nearly universal. Like clothes, shoes are made from patterns, and the shoe construction process begins with the mechanized stamping and cutting out of pattern pieces from leather and the other materials used. These patterns can be cut out with either metal dies or, increasingly, computer-controlled laser mechanisms.
Once the pieces of a shoe have all been cut out from the pattern, a machine places each piece over the correct area of a shoe-form or last. The pieces are then cemented in place to hold them steady. This stage of cementing is essentially temporary, as stitching is then added to truly secure and shape the shoe. High heels are generally made in three separate pieces: the sole, the heel and the upper, while flat shoes can be constructed in two pieces because their heels offer less structural complexity and may be solid leather while the heel on a woman's pump is often made from plastic and then covered with leather or other appropriate material.
Athletic shoes, with their increased use of high-tech materials are also often made in several segments but can include hot material being extruded onto a form, as opposed to traditional cutting and stitching. The key sections of the shoe are then joined together using both glues and nails, tacks and stitching, as the shoe's structure requires. A completed shoe is then stamped and labeled for size and brand.
As much as advances in shoe construction technology continue to be made, the shoe construction process will continue to take its cues from traditional styles and construction techniques which have persisted through reinvention across multiple cultures and centuries.