What the product is:
 
A 2-in-1 shampoo-conditioner is a haircare product that claims to cleanse (shampoo) and condition (like a rinse-out conditioner) in one step. Instead of using two separate products (one to wash, one to condition), you use one.
 
Benefits:
 
Convenience: One product rather than two means fewer bottles, less clutter, quicker bath/shower routines.
Cost-/space-efficient: If many in the household have different hair types but you pick a “general” 2-in-1, you might save money and storage space.
Simplification of routine: Especially good for kids, guests, or households where you want something simple.
Suitable for many hair types: 2-in-1s are formulated for “all hair types” or “family use” so can handle a variety of hair textures if hair is in reasonably good condition. 
One-step moisturizing/conditioning effect: Many 2-in-1s include conditioning agents to give hair smoother feel and easier detangling right after washing.
 
Typical Ingredients / Materials:
 
Surfactants (cleansers): e.g., sodium laureth sulfate, coco-glucoside, cocamidopropyl betaine. These help to remove oil, dirt. 
Conditioning agents: cationic polymers or silicones (to coat hair, smooth cuticle, detangle). 
Moisturisers / botanical extracts / oils: To appeal to families and gentler use, you’ll see ingredients like argan oil, wheat protein, aloe vera, shea butter. 
pH adjusters, preservatives, fragrance: As with any shampoo.
Gentle formulation for sensitive users: Some family 2-in-1s specify “dermatologically tested”, “free from sulphates/colourants” etc. 
 
 How to Use It
 
Wet hair thoroughly: Use lukewarm water, wet hair from scalp to ends.
Apply the 2-in-1: Squeeze a small to moderate amount into your palm depending on hair length/thickness.
Massage into scalp and hair: Work the product in, focusing on scalp for cleansing and then through the lengths so the conditioning effect can act. For example the Clicks product says: “Wet hair with lukewarm water. Lather a small amount … massage into scalp, then through to the ends. Rinse thoroughly.” 
Rinse completely: Make sure to rinse well so no residue remains, which could weigh hair down or cause buildup.
Optional repeat: Some people may do a second wash if hair is very dirty.
Dry & style: Proceed with drying, styling as usual. Because the product already conditions, you may not need a separate conditioner step (unless hair is very dry or damaged).