Theory:

Amoeba is celled single organism, found in ponds, ditches and freshwater ponds. They feed mostly on microorganisms.
 
Pseudopodia:
Amoeba moves one place to another by expanding and contracting pseudopodia. When they sense food around, with the help of pseudopodia, they surround, capture and engulf food.
Food vacuole and digestion:
The food gets trapped in the segment called food vacuole. Food vacuole of amoeba is fluid-filled membrane-bound structure starts inside the cytoplasm of the cell. The fluid inside vacuole contains several enzymes that digest the food.
The digestive juice ejects into the food vacuole, where the food particles digests and absorbs in the food vacuole. Later, an undigested food expelled out of the vacuole.
 
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Reference:
Amoeba: https://www.uzdevumi.lv/p/biologija/7-klase/viensuni-un-bakterijas-11931/re-7947692b-1395-46ce-b54d-b244eec44d7d