Energy Bars

These bars help to replace muscle glycogen (the energy)

Bars with a high in carbohydrates and less fat and protein are requested to eat before or after you have made the effort. And bars that have a slightly higher content of fat and protein are requested to eat an hour before you make the effort or anytime after it.

These bars are not a substitute for snacks, but those who make long routes use them as snacks to save time.

Energy Bites / Mini Bars - offer the same nutrition value only in smaller version.

Organic Bars - now many manufacturers offer more green bars rich in organic ingredients.

Raw Foods - another subcategory of energy bars that includes energy-rich foods such as nuts, seeds and fruits, that are cut into small pieces, pressed and compacted into bars.

Gels

These semi-liquid products are very rich in carbohydrate and are packaged in squeezable packages (1 or 2 oz.). They are easy to digest and provide very fast the energy boost. These gels are found in versions with caffeine (for fatigue) and sodium (for those who sweat excessively in very hot days)

Chews

The chews provides the same nutrition value as gels. Chewing requires slightly more digestive work than a gel, among the advantages may be to have an slower impact to the body.

Beverages

This category of food energy is known as "sports drink" with a high content of electrolytes (sodium, potassium, calcium and magnesium), and help to replace electrolytes that is consumed by muscle. These drinks provide extra muscle energy, and help against fatigue and decrease performance. 
Snacks

Most performance foods include sweet and fruity flavor, these snacks fill the need of the body for salt.