All prebiotic fibre is fibre, but not all fibre is prebiotic.
Regular fibre is a broad term for plant material that human digestive enzymes do not fully break down. It includes many types, from wheat bran to psyllium husk to vegetable fibre. Prebiotic fibre is more specific. It is used by beneficial gut bacteria in a way that may support the microbiome.
This difference matters when reading labels. A product can be high in fibre but not strongly prebiotic. Another product may have less thickness but better fermentation potential. Psyllium is known for gel formation and water holding. PHGG, acacia fibre, inulin and resistant starch are often discussed more in the prebiotic space, though they behave differently.
For daily Indian eating, you do not need to label every food. Dal, chana, vegetables, fruits, oats, onions, garlic, millets and cooled starches all add diversity. That diversity is useful because gut bacteria do not depend on one ingredient alone.
If choosing a supplement, match the fibre to the purpose. Regularity, satiety and microbiome support may need different fibres.
Prebiotic fibre is not a magic category. It is a more precise way to ask what the fibre does after it reaches the gut.