Final answer:
The process of bringing a solution into a cell is known as endocytosis, with a specific variation called pinocytosis for fluid intake, which is a type of active transport.
Step-by-step explanation:
Bringing a solution into a cell is a process known as endocytosis. This complex biological function is a type of active transport in which a cell takes in materials from the surroundings by engulfing them in an area of its plasma membrane. The membrane invaginates, forms a pocket around the material, and then pinches off, creating an intracellular vesicle. Among the variations of endocytosis, pinocytosis is specifically referred to as "cell drinking" because it enables a cell to take in fluid droplets containing dissolved substances. It results in the creation of smaller vesicles than phagocytosis, and these vesicles do not typically require merging with a lysosome.