Do postgres use implicit transaction in UPDATE ... RETURNING queries?

Can someone let me know if Postgres 15 uses implicit transactions for UPDATE...RETURNING queries?

For example, is there any differences between the two queries

BEGIN;
UPDATE counter
SET value = value + 1
RETURNING value;
COMMIT;

and

UPDATE counter
SET value = value + 1
RETURNING value;

Table is like below

CREATE TABLE IF NOT EXISTS counter
(    value      bigint PRIMARY KEY NOT NULL DEFAULT 0,    updated_at TIMESTAMPTZ        NOT NULL DEFAULT CURRENT_TIMESTAMP
);