Flu is a contagious disease that spreads around the United States every year, usually between October and May. Flu vaccine prevents millions of illnesses and flu-related visits to the doctor each year. CDC recommends everyone 6 months and older get vaccinated every flu season.
Vaccine Information Statement: Inactivated Influenza Vaccine (cdc.gov)

COVID-19 is caused by a virus that can lead to serious illness in adults and children.  The COVID-19 vaccine helps prevent severe illness and hospitalization.
Vaccine Information Statement: COVID-19 Vaccine

Pneumonia is caused by pneumococcal bacteria and is an infection of the lungs. The pneumonia vaccine helps to prevent this infection and is CDC recommended for people 65 and over, as well as people aged 19 - 64 with certain underlying conditions.
Vaccine Information Statement for Pneumonia Vaccine

RSV is a common respiratory virus from which most people recover in 1-2 weeks. However, RSV can be serious in adults ages 60 and over, particularly adults with certain chronic medical conditions, people who are frail, of advanced age or reside in long-term care facilities. Single-dose RSV vaccination should occur before the start of the fall RSV season.
Vaccine Information Statement: RSV Vaccine

Shingles is caused by the same virus that causes Chickenpox.  Shingles can be very painful and can lead to serious long-term complications.  The Shingles vaccine helps protect against a Shingles outbreak.
Vaccine Information Statement: Shingles Vaccine

Tetanus is a serious disease of the nervous system caused by a toxin-producing bacteria.  The CDC recommends a tetanus booster for adults every ten years.
Vaccine Information Statement: Tdap (Tetanus)