Final answer:
A bladder infection, also known as cystitis, is a common type of urinary tract infection where the bladder becomes infected by bacteria. Pyelonephritis is another type of urinary tract infection that affects the kidneys. Incontinence and prostatitis are unrelated to bladder infections.
Step-by-step explanation:
A bladder infection, also known as cystitis, is a common type of urinary tract infection where the urinary bladder becomes infected by bacteria. It is characterized by symptoms such as pain with urination, frequent urination, and feeling the need to urinate despite having an empty bladder. Pyelonephritis is a less common type of urinary tract infection that involves the infection of the kidneys. Incontinence refers to the involuntary loss of bladder control, while prostatitis is an infection or inflammation of the prostate gland.