1.Balayage is the technique of free-hand painting highlights onto the hair, creating a soft and natural gradation of lightness towards the ends. The result is the look of summers spent at the beach, or the fresh, unintentionally perfect highlights on a child. This natural-looking highlighting technique is not just for blondes, but is actually used on all shades of hair to add soft, sunkissed dimension. Balayage can be applied as a full balayage throughout all of your hair to give you the lighter look all-around without needing to maintain inevitable root grow-out as you would for other lightening methods. It can also be done as a partial, or mini, balayage, such as only around the face or upper area of your hair. 
Balayage highlights are usually just a few shades lighter than your base color, giving your locks natural depth and dimension. It blends so seamlessly into your natural color that balayage is easy to maintain with the right products and techniques. 

2.Ombre-ombré hair color and word definition is a degradation of colors from dark to light or light to dark,” says Byrant. Ombré hair color is generally darker at the roots through the mid-shaft and then gradually gets lighter from the mid-shaft to the ends. It’s ideal for clients looking for a low-maintenance style. If you ask for ombré hair colour, it means you’re asking for your roots to be left dark, and for the lower sections of your hair to gradually be lightened. This is ideal for making the lower sections look more voluminous, as light colours always look bigger than dark colours, which appear more compact. So if you need more volume on top, maybe a reverse-ombré style, which is lighter on top and darker at the ends, is better for you.
3. Global colour-Global hair color refers to a hair coloring technique that covers the entire length of your hair, uniformly from the tip to the roots. It is an excellent idea for people looking for an alternative hairdo without switching to shocking pop colors. It takes around 1-3 hours for a session of global hair color to conclude. This depends on which color you have chosen to dye your hair. It would fade slowly if it is a more natural color, such as shades of brown and black. But vibrant colors such as red tend to fade a little faster. You can make global hair color last longer by using color-protect shampoos and protectant sprays, minimizing exposure to heat, and washing your hair a little less.
4. Highlighting involves taking certain sections of hair and colouring them with a lighter colour. This helps give a variation in tones, creating the illusion of texture. The style is ideal for those who feel that their hair looks too flat and monotone.